Finding the Fourth Proportional to 9,326.72, 12,870.88 and 5,135.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,326.72 : 12,870.88 = 5,135.28 : x
2. Step 2: Convert to fraction form
   9,326.72/12,870.88 = 5,135.28/x
3. Step 3: Cross multiply
   9,326.72x = 12,870.88 × 5,135.28
4. Step 4: Simplify right side
   9,326.72x = 66,095,572.65
5. Step 5: Solve for x
   x = 66,095,572.65/9,326.72
6. Step 6: Final answer
   x = 7,086.69