Finding the Fourth Proportional to 257,411.72, 386,223.59 and 113,243.47

Step by Step Solution

1. Step 1: Write the proportion equation
   257,411.72 : 386,223.59 = 113,243.47 : x
2. Step 2: Convert to fraction form
   257,411.72/386,223.59 = 113,243.47/x
3. Step 3: Cross multiply
   257,411.72x = 386,223.59 × 113,243.47
4. Step 4: Simplify right side
   257,411.72x = 43,737,298,845.01
5. Step 5: Solve for x
   x = 43,737,298,845.01/257,411.72
6. Step 6: Final answer
   x = 169,911.84