Finding the Fourth Proportional to 21,343.72, 31,972.06 and 17,409

Step by Step Solution

1. Step 1: Write the proportion equation
   21,343.72 : 31,972.06 = 17,409 : x
2. Step 2: Convert to fraction form
   21,343.72/31,972.06 = 17,409/x
3. Step 3: Cross multiply
   21,343.72x = 31,972.06 × 17,409
4. Step 4: Simplify right side
   21,343.72x = 556,601,592.54
5. Step 5: Solve for x
   x = 556,601,592.54/21,343.72
6. Step 6: Final answer
   x = 26,078.00