Finding the Fourth Proportional to 86,608.20, 129,912.30 and 42,212.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86,608.20 : 129,912.30 = 42,212.10 : x
2. Step 2: Convert to fraction form
   86,608.20/129,912.30 = 42,212.10/x
3. Step 3: Cross multiply
   86,608.20x = 129,912.30 × 42,212.10
4. Step 4: Simplify right side
   86,608.20x = 5,483,870,998.83
5. Step 5: Solve for x
   x = 5,483,870,998.83/86,608.20
6. Step 6: Final answer
   x = 63,318.15