Finding the Third Proportional to 266,064 and 391,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   266,064 : 391,315.50 = 391,315.50 : x
2. Step 2: Convert to fraction form
   266,064/391,315.50 = 391,315.50/x
3. Step 3: Cross multiply
   266,064x = 391,315.50 × 391,315.50
4. Step 4: Simplify right side
   266,064x = 153,127,820,540.25
5. Step 5: Solve for x
   x = 153,127,820,540.25/266,064
6. Step 6: Final answer
   x = 575,530.02