Finding the Fourth Proportional to 7,901.72, 10,906.56 and 4,915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,901.72 : 10,906.56 = 4,915.78 : x
2. Step 2: Convert to fraction form
   7,901.72/10,906.56 = 4,915.78/x
3. Step 3: Cross multiply
   7,901.72x = 10,906.56 × 4,915.78
4. Step 4: Simplify right side
   7,901.72x = 53,614,249.52
5. Step 5: Solve for x
   x = 53,614,249.52/7,901.72
6. Step 6: Final answer
   x = 6,785.14