Finding the Fourth Proportional to 42,789.40, 64,175.90 and 16,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.40 : 64,175.90 = 16,490.72 : x
2. Step 2: Convert to fraction form
   42,789.40/64,175.90 = 16,490.72/x
3. Step 3: Cross multiply
   42,789.40x = 64,175.90 × 16,490.72
4. Step 4: Simplify right side
   42,789.40x = 1,058,306,875.63
5. Step 5: Solve for x
   x = 1,058,306,875.63/42,789.40
6. Step 6: Final answer
   x = 24,732.92