Finding the Fourth Proportional to 86,818.10, 130,421.55 and 83,513.30

Step by Step Solution

1. Step 1: Write the proportion equation
   86,818.10 : 130,421.55 = 83,513.30 : x
2. Step 2: Convert to fraction form
   86,818.10/130,421.55 = 83,513.30/x
3. Step 3: Cross multiply
   86,818.10x = 130,421.55 × 83,513.30
4. Step 4: Simplify right side
   86,818.10x = 10,891,934,031.62
5. Step 5: Solve for x
   x = 10,891,934,031.62/86,818.10
6. Step 6: Final answer
   x = 125,456.95