Finding the Third Proportional to 264,315 and 425,587.50

Step by Step Solution

1. Step 1: Write the proportion equation
   264,315 : 425,587.50 = 425,587.50 : x
2. Step 2: Convert to fraction form
   264,315/425,587.50 = 425,587.50/x
3. Step 3: Cross multiply
   264,315x = 425,587.50 × 425,587.50
4. Step 4: Simplify right side
   264,315x = 181,124,720,156.25
5. Step 5: Solve for x
   x = 181,124,720,156.25/264,315
6. Step 6: Final answer
   x = 685,260.84