Finding the Fourth Proportional to 9,108.78, 13,663.98 and 3,915.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.78 : 13,663.98 = 3,915.06 : x
2. Step 2: Convert to fraction form
   9,108.78/13,663.98 = 3,915.06/x
3. Step 3: Cross multiply
   9,108.78x = 13,663.98 × 3,915.06
4. Step 4: Simplify right side
   9,108.78x = 53,495,301.54
5. Step 5: Solve for x
   x = 53,495,301.54/9,108.78
6. Step 6: Final answer
   x = 5,872.94