Finding the Fourth Proportional to 9,330.72, 12,876.56 and 5,138.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,330.72 : 12,876.56 = 5,138.96 : x
2. Step 2: Convert to fraction form
   9,330.72/12,876.56 = 5,138.96/x
3. Step 3: Cross multiply
   9,330.72x = 12,876.56 × 5,138.96
4. Step 4: Simplify right side
   9,330.72x = 66,172,126.78
5. Step 5: Solve for x
   x = 66,172,126.78/9,330.72
6. Step 6: Final answer
   x = 7,091.86