Finding the Fourth Proportional to 9,138.89, 12,611.76 and 5,362.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,138.89 : 12,611.76 = 5,362.12 : x
2. Step 2: Convert to fraction form
   9,138.89/12,611.76 = 5,362.12/x
3. Step 3: Cross multiply
   9,138.89x = 12,611.76 × 5,362.12
4. Step 4: Simplify right side
   9,138.89x = 67,625,798.20
5. Step 5: Solve for x
   x = 67,625,798.20/9,138.89
6. Step 6: Final answer
   x = 7,399.78