Finding the Fourth Proportional to 12,278.88, 16,915.20 and 10,145.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,278.88 : 16,915.20 = 10,145.52 : x
2. Step 2: Convert to fraction form
   12,278.88/16,915.20 = 10,145.52/x
3. Step 3: Cross multiply
   12,278.88x = 16,915.20 × 10,145.52
4. Step 4: Simplify right side
   12,278.88x = 171,613,499.90
5. Step 5: Solve for x
   x = 171,613,499.90/12,278.88
6. Step 6: Final answer
   x = 13,976.32