Finding the Fourth Proportional to 9,279.30, 12,805.20 and 5,087.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,279.30 : 12,805.20 = 5,087.55 : x
2. Step 2: Convert to fraction form
   9,279.30/12,805.20 = 5,087.55/x
3. Step 3: Cross multiply
   9,279.30x = 12,805.20 × 5,087.55
4. Step 4: Simplify right side
   9,279.30x = 65,147,095.26
5. Step 5: Solve for x
   x = 65,147,095.26/9,279.30
6. Step 6: Final answer
   x = 7,020.69