Finding the Fourth Proportional to 478,354.86, 660,158.06 and 274,404.28

Step by Step Solution

1. Step 1: Write the proportion equation
   478,354.86 : 660,158.06 = 274,404.28 : x
2. Step 2: Convert to fraction form
   478,354.86/660,158.06 = 274,404.28/x
3. Step 3: Cross multiply
   478,354.86x = 660,158.06 × 274,404.28
4. Step 4: Simplify right side
   478,354.86x = 181,150,197,140.50
5. Step 5: Solve for x
   x = 181,150,197,140.50/478,354.86
6. Step 6: Final answer
   x = 378,694.17