Finding the Third Proportional to 90,778.50 and 243,895.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,778.50 : 243,895.50 = 243,895.50 : x
2. Step 2: Convert to fraction form
   90,778.50/243,895.50 = 243,895.50/x
3. Step 3: Cross multiply
   90,778.50x = 243,895.50 × 243,895.50
4. Step 4: Simplify right side
   90,778.50x = 59,485,014,920.25
5. Step 5: Solve for x
   x = 59,485,014,920.25/90,778.50
6. Step 6: Final answer
   x = 655,276.47