Finding the Fourth Proportional to 8,818.06, 12,158.28 and 7,620.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,818.06 : 12,158.28 = 7,620.88 : x
2. Step 2: Convert to fraction form
   8,818.06/12,158.28 = 7,620.88/x
3. Step 3: Cross multiply
   8,818.06x = 12,158.28 × 7,620.88
4. Step 4: Simplify right side
   8,818.06x = 92,656,792.89
5. Step 5: Solve for x
   x = 92,656,792.89/8,818.06
6. Step 6: Final answer
   x = 10,507.62