Finding the Fourth Proportional to 131,857.78, 181,964.61 and 71,428.43

Step by Step Solution

1. Step 1: Write the proportion equation
   131,857.78 : 181,964.61 = 71,428.43 : x
2. Step 2: Convert to fraction form
   131,857.78/181,964.61 = 71,428.43/x
3. Step 3: Cross multiply
   131,857.78x = 181,964.61 × 71,428.43
4. Step 4: Simplify right side
   131,857.78x = 12,997,446,407.86
5. Step 5: Solve for x
   x = 12,997,446,407.86/131,857.78
6. Step 6: Final answer
   x = 98,571.71