Finding the Third Proportional to 72,289 and 156,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,289 : 156,645.50 = 156,645.50 : x
2. Step 2: Convert to fraction form
   72,289/156,645.50 = 156,645.50/x
3. Step 3: Cross multiply
   72,289x = 156,645.50 × 156,645.50
4. Step 4: Simplify right side
   72,289x = 24,537,812,670.25
5. Step 5: Solve for x
   x = 24,537,812,670.25/72,289
6. Step 6: Final answer
   x = 339,440.48