Finding the Fourth Proportional to 81,747, 122,553.72 and 42,315.48

Step by Step Solution

1. Step 1: Write the proportion equation
   81,747 : 122,553.72 = 42,315.48 : x
2. Step 2: Convert to fraction form
   81,747/122,553.72 = 42,315.48/x
3. Step 3: Cross multiply
   81,747x = 122,553.72 × 42,315.48
4. Step 4: Simplify right side
   81,747x = 5,185,919,487.59
5. Step 5: Solve for x
   x = 5,185,919,487.59/81,747
6. Step 6: Final answer
   x = 63,438.65