Finding the Fourth Proportional to 663,798,978.38, 916,018,581.76 and 366,434,838.26

Step by Step Solution

1. Step 1: Write the proportion equation
   663,798,978.38 : 916,018,581.76 = 366,434,838.26 : x
2. Step 2: Convert to fraction form
   663,798,978.38/916,018,581.76 = 366,434,838.26/x
3. Step 3: Cross multiply
   663,798,978.38x = 916,018,581.76 × 366,434,838.26
4. Step 4: Simplify right side
   663,798,978.38x = 335,661,120,850,380,160
5. Step 5: Solve for x
   x = 335,661,120,850,380,160/663,798,978.38
6. Step 6: Final answer
   x = 505,666,823.52