Finding the Fourth Proportional to 9,931.12, 13,719.18 and 7,939.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,931.12 : 13,719.18 = 7,939.06 : x
2. Step 2: Convert to fraction form
   9,931.12/13,719.18 = 7,939.06/x
3. Step 3: Cross multiply
   9,931.12x = 13,719.18 × 7,939.06
4. Step 4: Simplify right side
   9,931.12x = 108,917,393.17
5. Step 5: Solve for x
   x = 108,917,393.17/9,931.12
6. Step 6: Final answer
   x = 10,967.28