Finding the Fourth Proportional to 9,131.28, 12,599.70 and 5,151.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,131.28 : 12,599.70 = 5,151.48 : x
2. Step 2: Convert to fraction form
   9,131.28/12,599.70 = 5,151.48/x
3. Step 3: Cross multiply
   9,131.28x = 12,599.70 × 5,151.48
4. Step 4: Simplify right side
   9,131.28x = 64,907,102.56
5. Step 5: Solve for x
   x = 64,907,102.56/9,131.28
6. Step 6: Final answer
   x = 7,108.22