Finding the Third Proportional to 253,158 and 392,500

Step by Step Solution

1. Step 1: Write the proportion equation
   253,158 : 392,500 = 392,500 : x
2. Step 2: Convert to fraction form
   253,158/392,500 = 392,500/x
3. Step 3: Cross multiply
   253,158x = 392,500 × 392,500
4. Step 4: Simplify right side
   253,158x = 154,056,250,000
5. Step 5: Solve for x
   x = 154,056,250,000/253,158
6. Step 6: Final answer
   x = 608,537.95