Finding the Fourth Proportional to 3,915.60, 5,877.72 and 3,099.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.60 : 5,877.72 = 3,099.12 : x
2. Step 2: Convert to fraction form
   3,915.60/5,877.72 = 3,099.12/x
3. Step 3: Cross multiply
   3,915.60x = 5,877.72 × 3,099.12
4. Step 4: Simplify right side
   3,915.60x = 18,215,759.61
5. Step 5: Solve for x
   x = 18,215,759.61/3,915.60
6. Step 6: Final answer
   x = 4,652.10