Finding the Fourth Proportional to 42,087.22, 63,128.77 and 15,789.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,087.22 : 63,128.77 = 15,789.91 : x
2. Step 2: Convert to fraction form
   42,087.22/63,128.77 = 15,789.91/x
3. Step 3: Cross multiply
   42,087.22x = 63,128.77 × 15,789.91
4. Step 4: Simplify right side
   42,087.22x = 996,797,596.71
5. Step 5: Solve for x
   x = 996,797,596.71/42,087.22
6. Step 6: Final answer
   x = 23,684.09