Finding the Fourth Proportional to 42,861.69, 64,250.15 and 20,332.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42,861.69 : 64,250.15 = 20,332.87 : x
2. Step 2: Convert to fraction form
   42,861.69/64,250.15 = 20,332.87/x
3. Step 3: Cross multiply
   42,861.69x = 64,250.15 × 20,332.87
4. Step 4: Simplify right side
   42,861.69x = 1,306,389,947.43
5. Step 5: Solve for x
   x = 1,306,389,947.43/42,861.69
6. Step 6: Final answer
   x = 30,479.20