Finding the Third Proportional to 172,916 and 253,140

Step by Step Solution

1. Step 1: Write the proportion equation
   172,916 : 253,140 = 253,140 : x
2. Step 2: Convert to fraction form
   172,916/253,140 = 253,140/x
3. Step 3: Cross multiply
   172,916x = 253,140 × 253,140
4. Step 4: Simplify right side
   172,916x = 64,079,859,600
5. Step 5: Solve for x
   x = 64,079,859,600/172,916
6. Step 6: Final answer
   x = 370,583.75