Finding the Third Proportional to 212,878 and 354,781.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,878 : 354,781.50 = 354,781.50 : x
2. Step 2: Convert to fraction form
   212,878/354,781.50 = 354,781.50/x
3. Step 3: Cross multiply
   212,878x = 354,781.50 × 354,781.50
4. Step 4: Simplify right side
   212,878x = 125,869,912,742.25
5. Step 5: Solve for x
   x = 125,869,912,742.25/212,878
6. Step 6: Final answer
   x = 591,277.22