Finding the Fourth Proportional to 42,391.54, 63,576.78 and 12,807.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,391.54 : 63,576.78 = 12,807.10 : x
2. Step 2: Convert to fraction form
   42,391.54/63,576.78 = 12,807.10/x
3. Step 3: Cross multiply
   42,391.54x = 63,576.78 × 12,807.10
4. Step 4: Simplify right side
   42,391.54x = 814,234,179.14
5. Step 5: Solve for x
   x = 814,234,179.14/42,391.54
6. Step 6: Final answer
   x = 19,207.47