Finding the Fourth Proportional to 9,185.20, 12,667.59 and 7,938.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,185.20 : 12,667.59 = 7,938.61 : x
2. Step 2: Convert to fraction form
   9,185.20/12,667.59 = 7,938.61/x
3. Step 3: Cross multiply
   9,185.20x = 12,667.59 × 7,938.61
4. Step 4: Simplify right side
   9,185.20x = 100,563,024.98
5. Step 5: Solve for x
   x = 100,563,024.98/9,185.20
6. Step 6: Final answer
   x = 10,948.38