Finding the Fourth Proportional to 42,790.31, 59,032.53 and 28,647.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,790.31 : 59,032.53 = 28,647.71 : x
2. Step 2: Convert to fraction form
   42,790.31/59,032.53 = 28,647.71/x
3. Step 3: Cross multiply
   42,790.31x = 59,032.53 × 28,647.71
4. Step 4: Simplify right side
   42,790.31x = 1,691,146,726.22
5. Step 5: Solve for x
   x = 1,691,146,726.22/42,790.31
6. Step 6: Final answer
   x = 39,521.72