Finding the Third Proportional to 34,428.25 and 72,990

Step by Step Solution

1. Step 1: Write the proportion equation
   34,428.25 : 72,990 = 72,990 : x
2. Step 2: Convert to fraction form
   34,428.25/72,990 = 72,990/x
3. Step 3: Cross multiply
   34,428.25x = 72,990 × 72,990
4. Step 4: Simplify right side
   34,428.25x = 5,327,540,100
5. Step 5: Solve for x
   x = 5,327,540,100/34,428.25
6. Step 6: Final answer
   x = 154,743.27