Finding the Third Proportional to 21,123.75 and 39,586.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.75 : 39,586.13 = 39,586.13 : x
2. Step 2: Convert to fraction form
   21,123.75/39,586.13 = 39,586.13/x
3. Step 3: Cross multiply
   21,123.75x = 39,586.13 × 39,586.13
4. Step 4: Simplify right side
   21,123.75x = 1,567,061,292.52
5. Step 5: Solve for x
   x = 1,567,061,292.52/21,123.75
6. Step 6: Final answer
   x = 74,184.81