Finding the Fourth Proportional to 42,139.52, 63,158.88 and 18,739.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,139.52 : 63,158.88 = 18,739.52 : x
2. Step 2: Convert to fraction form
   42,139.52/63,158.88 = 18,739.52/x
3. Step 3: Cross multiply
   42,139.52x = 63,158.88 × 18,739.52
4. Step 4: Simplify right side
   42,139.52x = 1,183,567,094.94
5. Step 5: Solve for x
   x = 1,183,567,094.94/42,139.52
6. Step 6: Final answer
   x = 28,086.87