Finding the Fourth Proportional to 8,931.88, 12,314.30 and 7,686.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,931.88 : 12,314.30 = 7,686.30 : x
2. Step 2: Convert to fraction form
   8,931.88/12,314.30 = 7,686.30/x
3. Step 3: Cross multiply
   8,931.88x = 12,314.30 × 7,686.30
4. Step 4: Simplify right side
   8,931.88x = 94,651,404.09
5. Step 5: Solve for x
   x = 94,651,404.09/8,931.88
6. Step 6: Final answer
   x = 10,597.03