Finding the Fourth Proportional to 57,898, 86,797.72 and 55,142.36

Step by Step Solution

1. Step 1: Write the proportion equation
   57,898 : 86,797.72 = 55,142.36 : x
2. Step 2: Convert to fraction form
   57,898/86,797.72 = 55,142.36/x
3. Step 3: Cross multiply
   57,898x = 86,797.72 × 55,142.36
4. Step 4: Simplify right side
   57,898x = 4,786,231,123.42
5. Step 5: Solve for x
   x = 4,786,231,123.42/57,898
6. Step 6: Final answer
   x = 82,666.61