Finding the Fourth Proportional to 8,785.72, 12,123.30 and 5,247.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.72 : 12,123.30 = 5,247.64 : x
2. Step 2: Convert to fraction form
   8,785.72/12,123.30 = 5,247.64/x
3. Step 3: Cross multiply
   8,785.72x = 12,123.30 × 5,247.64
4. Step 4: Simplify right side
   8,785.72x = 63,618,714.01
5. Step 5: Solve for x
   x = 63,618,714.01/8,785.72
6. Step 6: Final answer
   x = 7,241.15