Finding the Fourth Proportional to 8,139.30, 12,185.19 and 7,361.07

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.30 : 12,185.19 = 7,361.07 : x
2. Step 2: Convert to fraction form
   8,139.30/12,185.19 = 7,361.07/x
3. Step 3: Cross multiply
   8,139.30x = 12,185.19 × 7,361.07
4. Step 4: Simplify right side
   8,139.30x = 89,696,036.55
5. Step 5: Solve for x
   x = 89,696,036.55/8,139.30
6. Step 6: Final answer
   x = 11,020.12