Finding the Fourth Proportional to 42,839.30, 64,239.51 and 15,137.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,839.30 : 64,239.51 = 15,137.30 : x
2. Step 2: Convert to fraction form
   42,839.30/64,239.51 = 15,137.30/x
3. Step 3: Cross multiply
   42,839.30x = 64,239.51 × 15,137.30
4. Step 4: Simplify right side
   42,839.30x = 972,412,734.72
5. Step 5: Solve for x
   x = 972,412,734.72/42,839.30
6. Step 6: Final answer
   x = 22,699.08