Finding the Fourth Proportional to 10,215.78, 15,323.70 and 7,086.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.78 : 15,323.70 = 7,086.60 : x
2. Step 2: Convert to fraction form
   10,215.78/15,323.70 = 7,086.60/x
3. Step 3: Cross multiply
   10,215.78x = 15,323.70 × 7,086.60
4. Step 4: Simplify right side
   10,215.78x = 108,592,932.42
5. Step 5: Solve for x
   x = 108,592,932.42/10,215.78
6. Step 6: Final answer
   x = 10,629.92