Finding the Third Proportional to 812.50 and 1,766.50

Step by Step Solution

1. Step 1: Write the proportion equation
   812.50 : 1,766.50 = 1,766.50 : x
2. Step 2: Convert to fraction form
   812.50/1,766.50 = 1,766.50/x
3. Step 3: Cross multiply
   812.50x = 1,766.50 × 1,766.50
4. Step 4: Simplify right side
   812.50x = 3,120,522.25
5. Step 5: Solve for x
   x = 3,120,522.25/812.50
6. Step 6: Final answer
   x = 3,840.64