Finding the Fourth Proportional to 9,720.18, 14,585.40 and 4,456.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720.18 : 14,585.40 = 4,456.80 : x
2. Step 2: Convert to fraction form
   9,720.18/14,585.40 = 4,456.80/x
3. Step 3: Cross multiply
   9,720.18x = 14,585.40 × 4,456.80
4. Step 4: Simplify right side
   9,720.18x = 65,004,210.72
5. Step 5: Solve for x
   x = 65,004,210.72/9,720.18
6. Step 6: Final answer
   x = 6,687.55