Finding the Fourth Proportional to 8,500.72, 11,730.30 and 4,915.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,500.72 : 11,730.30 = 4,915.91 : x
2. Step 2: Convert to fraction form
   8,500.72/11,730.30 = 4,915.91/x
3. Step 3: Cross multiply
   8,500.72x = 11,730.30 × 4,915.91
4. Step 4: Simplify right side
   8,500.72x = 57,665,099.07
5. Step 5: Solve for x
   x = 57,665,099.07/8,500.72
6. Step 6: Final answer
   x = 6,783.55