Finding the Fourth Proportional to 399,399.71, 599,104.86 and 133,160.31

Step by Step Solution

1. Step 1: Write the proportion equation
   399,399.71 : 599,104.86 = 133,160.31 : x
2. Step 2: Convert to fraction form
   399,399.71/599,104.86 = 133,160.31/x
3. Step 3: Cross multiply
   399,399.71x = 599,104.86 × 133,160.31
4. Step 4: Simplify right side
   399,399.71x = 79,776,989,379.46
5. Step 5: Solve for x
   x = 79,776,989,379.46/399,399.71
6. Step 6: Final answer
   x = 199,742.23