Finding the Fourth Proportional to 9,139.16, 12,610.35 and 5,553.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.16 : 12,610.35 = 5,553.38 : x
2. Step 2: Convert to fraction form
   9,139.16/12,610.35 = 5,553.38/x
3. Step 3: Cross multiply
   9,139.16x = 12,610.35 × 5,553.38
4. Step 4: Simplify right side
   9,139.16x = 70,030,065.48
5. Step 5: Solve for x
   x = 70,030,065.48/9,139.16
6. Step 6: Final answer
   x = 7,662.64