Finding the Third Proportional to 21,135.50 and 31,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,135.50 : 31,645.50 = 31,645.50 : x
2. Step 2: Convert to fraction form
   21,135.50/31,645.50 = 31,645.50/x
3. Step 3: Cross multiply
   21,135.50x = 31,645.50 × 31,645.50
4. Step 4: Simplify right side
   21,135.50x = 1,001,437,670.25
5. Step 5: Solve for x
   x = 1,001,437,670.25/21,135.50
6. Step 6: Final answer
   x = 47,381.78