Finding the Fourth Proportional to 42,789.79, 64,178.20 and 16,490.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.79 : 64,178.20 = 16,490.71 : x
2. Step 2: Convert to fraction form
   42,789.79/64,178.20 = 16,490.71/x
3. Step 3: Cross multiply
   42,789.79x = 64,178.20 × 16,490.71
4. Step 4: Simplify right side
   42,789.79x = 1,058,344,084.52
5. Step 5: Solve for x
   x = 1,058,344,084.52/42,789.79
6. Step 6: Final answer
   x = 24,733.57