Finding the Fourth Proportional to 86,613.10, 121,433.30 and 86,613.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86,613.10 : 121,433.30 = 86,613.10 : x
2. Step 2: Convert to fraction form
   86,613.10/121,433.30 = 86,613.10/x
3. Step 3: Cross multiply
   86,613.10x = 121,433.30 × 86,613.10
4. Step 4: Simplify right side
   86,613.10x = 10,517,714,556.23
5. Step 5: Solve for x
   x = 10,517,714,556.23/86,613.10
6. Step 6: Final answer
   x = 121,433.30