Finding the Fourth Proportional to 9,400.32, 12,942.86 and 7,981.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,400.32 : 12,942.86 = 7,981.07 : x
2. Step 2: Convert to fraction form
   9,400.32/12,942.86 = 7,981.07/x
3. Step 3: Cross multiply
   9,400.32x = 12,942.86 × 7,981.07
4. Step 4: Simplify right side
   9,400.32x = 103,297,767.04
5. Step 5: Solve for x
   x = 103,297,767.04/9,400.32
6. Step 6: Final answer
   x = 10,988.75