Finding the Fourth Proportional to 12,607.84, 17,395.32 and 8,131.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,607.84 : 17,395.32 = 8,131.78 : x
2. Step 2: Convert to fraction form
   12,607.84/17,395.32 = 8,131.78/x
3. Step 3: Cross multiply
   12,607.84x = 17,395.32 × 8,131.78
4. Step 4: Simplify right side
   12,607.84x = 141,454,915.27
5. Step 5: Solve for x
   x = 141,454,915.27/12,607.84
6. Step 6: Final answer
   x = 11,219.60