Finding the Fourth Proportional to 9,389.58, 12,931.20 and 9,185.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.58 : 12,931.20 = 9,185.46 : x
2. Step 2: Convert to fraction form
   9,389.58/12,931.20 = 9,185.46/x
3. Step 3: Cross multiply
   9,389.58x = 12,931.20 × 9,185.46
4. Step 4: Simplify right side
   9,389.58x = 118,779,020.35
5. Step 5: Solve for x
   x = 118,779,020.35/9,389.58
6. Step 6: Final answer
   x = 12,650.09