Finding the Fourth Proportional to 86,658.73, 129,944.35 and 42,218.89

Step by Step Solution

1. Step 1: Write the proportion equation
   86,658.73 : 129,944.35 = 42,218.89 : x
2. Step 2: Convert to fraction form
   86,658.73/129,944.35 = 42,218.89/x
3. Step 3: Cross multiply
   86,658.73x = 129,944.35 × 42,218.89
4. Step 4: Simplify right side
   86,658.73x = 5,486,105,946.68
5. Step 5: Solve for x
   x = 5,486,105,946.68/86,658.73
6. Step 6: Final answer
   x = 63,307.02