Finding the Fourth Proportional to 42,087.52, 63,138.56 and 18,715.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,087.52 : 63,138.56 = 18,715.76 : x
2. Step 2: Convert to fraction form
   42,087.52/63,138.56 = 18,715.76/x
3. Step 3: Cross multiply
   42,087.52x = 63,138.56 × 18,715.76
4. Step 4: Simplify right side
   42,087.52x = 1,181,686,135.71
5. Step 5: Solve for x
   x = 1,181,686,135.71/42,087.52
6. Step 6: Final answer
   x = 28,076.88