Finding the Fourth Proportional to 57,932.37, 86,900.18 and 20,487.15

Step by Step Solution

1. Step 1: Write the proportion equation
   57,932.37 : 86,900.18 = 20,487.15 : x
2. Step 2: Convert to fraction form
   57,932.37/86,900.18 = 20,487.15/x
3. Step 3: Cross multiply
   57,932.37x = 86,900.18 × 20,487.15
4. Step 4: Simplify right side
   57,932.37x = 1,780,336,920.25
5. Step 5: Solve for x
   x = 1,780,336,920.25/57,932.37
6. Step 6: Final answer
   x = 30,731.30