Finding the Fourth Proportional to 8,728.40, 12,045.50 and 5,003.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,728.40 : 12,045.50 = 5,003.12 : x
2. Step 2: Convert to fraction form
   8,728.40/12,045.50 = 5,003.12/x
3. Step 3: Cross multiply
   8,728.40x = 12,045.50 × 5,003.12
4. Step 4: Simplify right side
   8,728.40x = 60,265,081.96
5. Step 5: Solve for x
   x = 60,265,081.96/8,728.40
6. Step 6: Final answer
   x = 6,904.48