Finding the Fourth Proportional to 21,116.94, 31,642.56 and 7,962.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,116.94 : 31,642.56 = 7,962.12 : x
2. Step 2: Convert to fraction form
   21,116.94/31,642.56 = 7,962.12/x
3. Step 3: Cross multiply
   21,116.94x = 31,642.56 × 7,962.12
4. Step 4: Simplify right side
   21,116.94x = 251,941,859.83
5. Step 5: Solve for x
   x = 251,941,859.83/21,116.94
6. Step 6: Final answer
   x = 11,930.79