Finding the Fourth Proportional to 11,740.72, 17,622.66 and 7,981

Step by Step Solution

1. Step 1: Write the proportion equation
   11,740.72 : 17,622.66 = 7,981 : x
2. Step 2: Convert to fraction form
   11,740.72/17,622.66 = 7,981/x
3. Step 3: Cross multiply
   11,740.72x = 17,622.66 × 7,981
4. Step 4: Simplify right side
   11,740.72x = 140,646,449.46
5. Step 5: Solve for x
   x = 140,646,449.46/11,740.72
6. Step 6: Final answer
   x = 11,979.37