Finding the Fourth Proportional to 9,139.59, 12,613.69 and 5,554.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.59 : 12,613.69 = 5,554.73 : x
2. Step 2: Convert to fraction form
   9,139.59/12,613.69 = 5,554.73/x
3. Step 3: Cross multiply
   9,139.59x = 12,613.69 × 5,554.73
4. Step 4: Simplify right side
   9,139.59x = 70,065,680.73
5. Step 5: Solve for x
   x = 70,065,680.73/9,139.59
6. Step 6: Final answer
   x = 7,666.17