Finding the Third Proportional to 122,312 and 172,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   122,312 : 172,242.50 = 172,242.50 : x
2. Step 2: Convert to fraction form
   122,312/172,242.50 = 172,242.50/x
3. Step 3: Cross multiply
   122,312x = 172,242.50 × 172,242.50
4. Step 4: Simplify right side
   122,312x = 29,667,478,806.25
5. Step 5: Solve for x
   x = 29,667,478,806.25/122,312
6. Step 6: Final answer
   x = 242,555.75