Finding the Fourth Proportional to 9,395.55, 12,939.62 and 9,191.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,395.55 : 12,939.62 = 9,191.43 : x
2. Step 2: Convert to fraction form
   9,395.55/12,939.62 = 9,191.43/x
3. Step 3: Cross multiply
   9,395.55x = 12,939.62 × 9,191.43
4. Step 4: Simplify right side
   9,395.55x = 118,933,565.50
5. Step 5: Solve for x
   x = 118,933,565.50/9,395.55
6. Step 6: Final answer
   x = 12,658.50