Finding the Fourth Proportional to 21,308.73, 31,972.31 and 11,436.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,308.73 : 31,972.31 = 11,436.47 : x
2. Step 2: Convert to fraction form
   21,308.73/31,972.31 = 11,436.47/x
3. Step 3: Cross multiply
   21,308.73x = 31,972.31 × 11,436.47
4. Step 4: Simplify right side
   21,308.73x = 365,650,521.89
5. Step 5: Solve for x
   x = 365,650,521.89/21,308.73
6. Step 6: Final answer
   x = 17,159.66