Finding the Third Proportional to 21,321 and 31,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,321 : 31,900.50 = 31,900.50 : x
2. Step 2: Convert to fraction form
   21,321/31,900.50 = 31,900.50/x
3. Step 3: Cross multiply
   21,321x = 31,900.50 × 31,900.50
4. Step 4: Simplify right side
   21,321x = 1,017,641,900.25
5. Step 5: Solve for x
   x = 1,017,641,900.25/21,321
6. Step 6: Final answer
   x = 47,729.56