Finding the Fourth Proportional to 8,758.90, 12,087.27 and 5,615.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,758.90 : 12,087.27 = 5,615.08 : x
2. Step 2: Convert to fraction form
   8,758.90/12,087.27 = 5,615.08/x
3. Step 3: Cross multiply
   8,758.90x = 12,087.27 × 5,615.08
4. Step 4: Simplify right side
   8,758.90x = 67,870,988.03
5. Step 5: Solve for x
   x = 67,870,988.03/8,758.90
6. Step 6: Final answer
   x = 7,748.80