Finding the Fourth Proportional to 42,078.96, 63,129.42 and 15,784.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,078.96 : 63,129.42 = 15,784.20 : x
2. Step 2: Convert to fraction form
   42,078.96/63,129.42 = 15,784.20/x
3. Step 3: Cross multiply
   42,078.96x = 63,129.42 × 15,784.20
4. Step 4: Simplify right side
   42,078.96x = 996,447,391.16
5. Step 5: Solve for x
   x = 996,447,391.16/42,078.96
6. Step 6: Final answer
   x = 23,680.42