Finding the Fourth Proportional to 9,359.42, 12,916.68 and 5,381.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.42 : 12,916.68 = 5,381.78 : x
2. Step 2: Convert to fraction form
   9,359.42/12,916.68 = 5,381.78/x
3. Step 3: Cross multiply
   9,359.42x = 12,916.68 × 5,381.78
4. Step 4: Simplify right side
   9,359.42x = 69,514,730.09
5. Step 5: Solve for x
   x = 69,514,730.09/9,359.42
6. Step 6: Final answer
   x = 7,427.25