Finding the Fourth Proportional to 9,139.98, 12,613.07 and 5,160.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.98 : 12,613.07 = 5,160.99 : x
2. Step 2: Convert to fraction form
   9,139.98/12,613.07 = 5,160.99/x
3. Step 3: Cross multiply
   9,139.98x = 12,613.07 × 5,160.99
4. Step 4: Simplify right side
   9,139.98x = 65,095,941.04
5. Step 5: Solve for x
   x = 65,095,941.04/9,139.98
6. Step 6: Final answer
   x = 7,122.11