Finding the Third Proportional to 21,387 and 31,897.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,387 : 31,897.50 = 31,897.50 : x
2. Step 2: Convert to fraction form
   21,387/31,897.50 = 31,897.50/x
3. Step 3: Cross multiply
   21,387x = 31,897.50 × 31,897.50
4. Step 4: Simplify right side
   21,387x = 1,017,450,506.25
5. Step 5: Solve for x
   x = 1,017,450,506.25/21,387
6. Step 6: Final answer
   x = 47,573.32