Finding the Fourth Proportional to 1,117,697.06, 1,676,561.31 and 318,978.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117,697.06 : 1,676,561.31 = 318,978.70 : x
2. Step 2: Convert to fraction form
   1,117,697.06/1,676,561.31 = 318,978.70/x
3. Step 3: Cross multiply
   1,117,697.06x = 1,676,561.31 × 318,978.70
4. Step 4: Simplify right side
   1,117,697.06x = 534,787,342,942.69
5. Step 5: Solve for x
   x = 534,787,342,942.69/1,117,697.06
6. Step 6: Final answer
   x = 478,472.53