Finding the Third Proportional to 315,657 and 425,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,657 : 425,290.50 = 425,290.50 : x
2. Step 2: Convert to fraction form
   315,657/425,290.50 = 425,290.50/x
3. Step 3: Cross multiply
   315,657x = 425,290.50 × 425,290.50
4. Step 4: Simplify right side
   315,657x = 180,872,009,390.25
5. Step 5: Solve for x
   x = 180,872,009,390.25/315,657
6. Step 6: Final answer
   x = 573,001.74