Finding the Fourth Proportional to 81,663.30, 122,555.70 and 42,200.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,663.30 : 122,555.70 = 42,200.10 : x
2. Step 2: Convert to fraction form
   81,663.30/122,555.70 = 42,200.10/x
3. Step 3: Cross multiply
   81,663.30x = 122,555.70 × 42,200.10
4. Step 4: Simplify right side
   81,663.30x = 5,171,862,795.57
5. Step 5: Solve for x
   x = 5,171,862,795.57/81,663.30
6. Step 6: Final answer
   x = 63,331.54