Finding the Fourth Proportional to 42,732.31, 64,121.42 and 17,789.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,732.31 : 64,121.42 = 17,789.58 : x
2. Step 2: Convert to fraction form
   42,732.31/64,121.42 = 17,789.58/x
3. Step 3: Cross multiply
   42,732.31x = 64,121.42 × 17,789.58
4. Step 4: Simplify right side
   42,732.31x = 1,140,692,721.25
5. Step 5: Solve for x
   x = 1,140,692,721.25/42,732.31
6. Step 6: Final answer
   x = 26,693.92