Finding the Fourth Proportional to 221,429.72, 331,946.78 and 86,462.39

Step by Step Solution

1. Step 1: Write the proportion equation
   221,429.72 : 331,946.78 = 86,462.39 : x
2. Step 2: Convert to fraction form
   221,429.72/331,946.78 = 86,462.39/x
3. Step 3: Cross multiply
   221,429.72x = 331,946.78 × 86,462.39
4. Step 4: Simplify right side
   221,429.72x = 28,700,911,294.83
5. Step 5: Solve for x
   x = 28,700,911,294.83/221,429.72
6. Step 6: Final answer
   x = 129,616.35