Finding the Fourth Proportional to 21,116.30, 31,833 and 19,689.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,116.30 : 31,833 = 19,689.48 : x
2. Step 2: Convert to fraction form
   21,116.30/31,833 = 19,689.48/x
3. Step 3: Cross multiply
   21,116.30x = 31,833 × 19,689.48
4. Step 4: Simplify right side
   21,116.30x = 626,775,216.84
5. Step 5: Solve for x
   x = 626,775,216.84/21,116.30
6. Step 6: Final answer
   x = 29,682.06