Finding the Fourth Proportional to 131,857.78, 181,964.60 and 71,428.42

Step by Step Solution

1. Step 1: Write the proportion equation
   131,857.78 : 181,964.60 = 71,428.42 : x
2. Step 2: Convert to fraction form
   131,857.78/181,964.60 = 71,428.42/x
3. Step 3: Cross multiply
   131,857.78x = 181,964.60 × 71,428.42
4. Step 4: Simplify right side
   131,857.78x = 12,997,443,873.93
5. Step 5: Solve for x
   x = 12,997,443,873.93/131,857.78
6. Step 6: Final answer
   x = 98,571.69