Finding the Third Proportional to 13,972.31 and 21,139.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,972.31 : 21,139.13 = 21,139.13 : x
2. Step 2: Convert to fraction form
   13,972.31/21,139.13 = 21,139.13/x
3. Step 3: Cross multiply
   13,972.31x = 21,139.13 × 21,139.13
4. Step 4: Simplify right side
   13,972.31x = 446,862,605.77
5. Step 5: Solve for x
   x = 446,862,605.77/13,972.31
6. Step 6: Final answer
   x = 31,982.01