Finding the Fourth Proportional to 57,871.16, 86,813.69 and 20,423.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,871.16 : 86,813.69 = 20,423.50 : x
2. Step 2: Convert to fraction form
   57,871.16/86,813.69 = 20,423.50/x
3. Step 3: Cross multiply
   57,871.16x = 86,813.69 × 20,423.50
4. Step 4: Simplify right side
   57,871.16x = 1,773,039,397.72
5. Step 5: Solve for x
   x = 1,773,039,397.72/57,871.16
6. Step 6: Final answer
   x = 30,637.70