Finding the Fourth Proportional to 8,848.35, 12,131.58 and 8,690.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,848.35 : 12,131.58 = 8,690.40 : x
2. Step 2: Convert to fraction form
   8,848.35/12,131.58 = 8,690.40/x
3. Step 3: Cross multiply
   8,848.35x = 12,131.58 × 8,690.40
4. Step 4: Simplify right side
   8,848.35x = 105,428,282.83
5. Step 5: Solve for x
   x = 105,428,282.83/8,848.35
6. Step 6: Final answer
   x = 11,915.02