Finding the Fourth Proportional to 86,620.23, 129,825.71 and 42,180.39

Step by Step Solution

1. Step 1: Write the proportion equation
   86,620.23 : 129,825.71 = 42,180.39 : x
2. Step 2: Convert to fraction form
   86,620.23/129,825.71 = 42,180.39/x
3. Step 3: Cross multiply
   86,620.23x = 129,825.71 × 42,180.39
4. Step 4: Simplify right side
   86,620.23x = 5,476,098,868.92
5. Step 5: Solve for x
   x = 5,476,098,868.92/86,620.23
6. Step 6: Final answer
   x = 63,219.63