Finding the Fourth Proportional to 9,868.64, 13,616.30 and 5,618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,868.64 : 13,616.30 = 5,618.72 : x
2. Step 2: Convert to fraction form
   9,868.64/13,616.30 = 5,618.72/x
3. Step 3: Cross multiply
   9,868.64x = 13,616.30 × 5,618.72
4. Step 4: Simplify right side
   9,868.64x = 76,506,225.22
5. Step 5: Solve for x
   x = 76,506,225.22/9,868.64
6. Step 6: Final answer
   x = 7,752.46