Finding the Fourth Proportional to 42,371.64, 63,557.91 and 12,789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,371.64 : 63,557.91 = 12,789.72 : x
2. Step 2: Convert to fraction form
   42,371.64/63,557.91 = 12,789.72/x
3. Step 3: Cross multiply
   42,371.64x = 63,557.91 × 12,789.72
4. Step 4: Simplify right side
   42,371.64x = 812,887,872.69
5. Step 5: Solve for x
   x = 812,887,872.69/42,371.64
6. Step 6: Final answer
   x = 19,184.72