Finding the Third Proportional to 21,428 and 31,304.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,428 : 31,304.25 = 31,304.25 : x
2. Step 2: Convert to fraction form
   21,428/31,304.25 = 31,304.25/x
3. Step 3: Cross multiply
   21,428x = 31,304.25 × 31,304.25
4. Step 4: Simplify right side
   21,428x = 979,956,068.06
5. Step 5: Solve for x
   x = 979,956,068.06/21,428
6. Step 6: Final answer
   x = 45,732.50