Finding the Fourth Proportional to 21,422.31, 29,566.89 and 12,471.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,422.31 : 29,566.89 = 12,471.18 : x
2. Step 2: Convert to fraction form
   21,422.31/29,566.89 = 12,471.18/x
3. Step 3: Cross multiply
   21,422.31x = 29,566.89 × 12,471.18
4. Step 4: Simplify right side
   21,422.31x = 368,734,007.23
5. Step 5: Solve for x
   x = 368,734,007.23/21,422.31
6. Step 6: Final answer
   x = 17,212.62