Finding the Fourth Proportional to 86,638.01, 129,940.61 and 42,220.04

Step by Step Solution

1. Step 1: Write the proportion equation
   86,638.01 : 129,940.61 = 42,220.04 : x
2. Step 2: Convert to fraction form
   86,638.01/129,940.61 = 42,220.04/x
3. Step 3: Cross multiply
   86,638.01x = 129,940.61 × 42,220.04
4. Step 4: Simplify right side
   86,638.01x = 5,486,096,891.02
5. Step 5: Solve for x
   x = 5,486,096,891.02/86,638.01
6. Step 6: Final answer
   x = 63,322.06