Finding the Fourth Proportional to 42,128.71, 63,144.46 and 15,816.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.71 : 63,144.46 = 15,816.67 : x
2. Step 2: Convert to fraction form
   42,128.71/63,144.46 = 15,816.67/x
3. Step 3: Cross multiply
   42,128.71x = 63,144.46 × 15,816.67
4. Step 4: Simplify right side
   42,128.71x = 998,735,086.15
5. Step 5: Solve for x
   x = 998,735,086.15/42,128.71
6. Step 6: Final answer
   x = 23,706.76