Finding the Third Proportional to 353,422.50 and 772,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   353,422.50 : 772,816.50 = 772,816.50 : x
2. Step 2: Convert to fraction form
   353,422.50/772,816.50 = 772,816.50/x
3. Step 3: Cross multiply
   353,422.50x = 772,816.50 × 772,816.50
4. Step 4: Simplify right side
   353,422.50x = 597,245,342,672.25
5. Step 5: Solve for x
   x = 597,245,342,672.25/353,422.50
6. Step 6: Final answer
   x = 1,689,890.55