Finding the Third Proportional to 34,389 and 72,921

Step by Step Solution

1. Step 1: Write the proportion equation
   34,389 : 72,921 = 72,921 : x
2. Step 2: Convert to fraction form
   34,389/72,921 = 72,921/x
3. Step 3: Cross multiply
   34,389x = 72,921 × 72,921
4. Step 4: Simplify right side
   34,389x = 5,317,472,241
5. Step 5: Solve for x
   x = 5,317,472,241/34,389
6. Step 6: Final answer
   x = 154,627.13