Finding the Fourth Proportional to 1,318,468,784.10, 1,978,018,104.15 and 398,354,144.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,318,468,784.10 : 1,978,018,104.15 = 398,354,144.10 : x
2. Step 2: Convert to fraction form
   1,318,468,784.10/1,978,018,104.15 = 398,354,144.10/x
3. Step 3: Cross multiply
   1,318,468,784.10x = 1,978,018,104.15 × 398,354,144.10
4. Step 4: Simplify right side
   1,318,468,784.10x = 787,951,708,892,978,048
5. Step 5: Solve for x
   x = 787,951,708,892,978,048/1,318,468,784.10
6. Step 6: Final answer
   x = 597,626,366.58