Finding the Fourth Proportional to 21,081.62, 31,617.56 and 7,935.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.62 : 31,617.56 = 7,935.32 : x
2. Step 2: Convert to fraction form
   21,081.62/31,617.56 = 7,935.32/x
3. Step 3: Cross multiply
   21,081.62x = 31,617.56 × 7,935.32
4. Step 4: Simplify right side
   21,081.62x = 250,895,258.45
5. Step 5: Solve for x
   x = 250,895,258.45/21,081.62
6. Step 6: Final answer
   x = 11,901.14