Finding the Fourth Proportional to 9,326.72, 12,870.40 and 5,134.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,326.72 : 12,870.40 = 5,134.88 : x
2. Step 2: Convert to fraction form
   9,326.72/12,870.40 = 5,134.88/x
3. Step 3: Cross multiply
   9,326.72x = 12,870.40 × 5,134.88
4. Step 4: Simplify right side
   9,326.72x = 66,087,959.55
5. Step 5: Solve for x
   x = 66,087,959.55/9,326.72
6. Step 6: Final answer
   x = 7,085.87