Finding the Fourth Proportional to 9,340.89, 12,889.90 and 5,307.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,340.89 : 12,889.90 = 5,307.63 : x
2. Step 2: Convert to fraction form
   9,340.89/12,889.90 = 5,307.63/x
3. Step 3: Cross multiply
   9,340.89x = 12,889.90 × 5,307.63
4. Step 4: Simplify right side
   9,340.89x = 68,414,778.23
5. Step 5: Solve for x
   x = 68,414,778.23/9,340.89
6. Step 6: Final answer
   x = 7,324.23