Finding the Third Proportional to 391,928 and 572,766.50

Step by Step Solution

1. Step 1: Write the proportion equation
   391,928 : 572,766.50 = 572,766.50 : x
2. Step 2: Convert to fraction form
   391,928/572,766.50 = 572,766.50/x
3. Step 3: Cross multiply
   391,928x = 572,766.50 × 572,766.50
4. Step 4: Simplify right side
   391,928x = 328,061,463,522.25
5. Step 5: Solve for x
   x = 328,061,463,522.25/391,928
6. Step 6: Final answer
   x = 837,045.23