Finding the Third Proportional to 367,978.50 and 779,657.50

Step by Step Solution

1. Step 1: Write the proportion equation
   367,978.50 : 779,657.50 = 779,657.50 : x
2. Step 2: Convert to fraction form
   367,978.50/779,657.50 = 779,657.50/x
3. Step 3: Cross multiply
   367,978.50x = 779,657.50 × 779,657.50
4. Step 4: Simplify right side
   367,978.50x = 607,865,817,306.25
5. Step 5: Solve for x
   x = 607,865,817,306.25/367,978.50
6. Step 6: Final answer
   x = 1,651,905.80