Finding the Third Proportional to 172,815 and 247,126.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172,815 : 247,126.50 = 247,126.50 : x
2. Step 2: Convert to fraction form
   172,815/247,126.50 = 247,126.50/x
3. Step 3: Cross multiply
   172,815x = 247,126.50 × 247,126.50
4. Step 4: Simplify right side
   172,815x = 61,071,507,002.25
5. Step 5: Solve for x
   x = 61,071,507,002.25/172,815
6. Step 6: Final answer
   x = 353,392.40