Finding the Fourth Proportional to 913,499.55, 1,370,288.21 and 282,425.31

Step by Step Solution

1. Step 1: Write the proportion equation
   913,499.55 : 1,370,288.21 = 282,425.31 : x
2. Step 2: Convert to fraction form
   913,499.55/1,370,288.21 = 282,425.31/x
3. Step 3: Cross multiply
   913,499.55x = 1,370,288.21 × 282,425.31
4. Step 4: Simplify right side
   913,499.55x = 387,004,071,086.47
5. Step 5: Solve for x
   x = 387,004,071,086.47/913,499.55
6. Step 6: Final answer
   x = 423,649.99