Finding the Fourth Proportional to 9,139.94, 12,612.42 and 5,161.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.94 : 12,612.42 = 5,161.46 : x
2. Step 2: Convert to fraction form
   9,139.94/12,612.42 = 5,161.46/x
3. Step 3: Cross multiply
   9,139.94x = 12,612.42 × 5,161.46
4. Step 4: Simplify right side
   9,139.94x = 65,098,501.33
5. Step 5: Solve for x
   x = 65,098,501.33/9,139.94
6. Step 6: Final answer
   x = 7,122.42