Finding the Third Proportional to 287,779.50 and 632,664

Step by Step Solution

1. Step 1: Write the proportion equation
   287,779.50 : 632,664 = 632,664 : x
2. Step 2: Convert to fraction form
   287,779.50/632,664 = 632,664/x
3. Step 3: Cross multiply
   287,779.50x = 632,664 × 632,664
4. Step 4: Simplify right side
   287,779.50x = 400,263,736,896
5. Step 5: Solve for x
   x = 400,263,736,896/287,779.50
6. Step 6: Final answer
   x = 1,390,869.53