Finding the Fourth Proportional to 8,406.72, 11,600.57 and 4,870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,406.72 : 11,600.57 = 4,870.15 : x
2. Step 2: Convert to fraction form
   8,406.72/11,600.57 = 4,870.15/x
3. Step 3: Cross multiply
   8,406.72x = 11,600.57 × 4,870.15
4. Step 4: Simplify right side
   8,406.72x = 56,496,499.16
5. Step 5: Solve for x
   x = 56,496,499.16/8,406.72
6. Step 6: Final answer
   x = 6,720.40