Finding the Third Proportional to 243,297 and 387,427.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,297 : 387,427.50 = 387,427.50 : x
2. Step 2: Convert to fraction form
   243,297/387,427.50 = 387,427.50/x
3. Step 3: Cross multiply
   243,297x = 387,427.50 × 387,427.50
4. Step 4: Simplify right side
   243,297x = 150,100,067,756.25
5. Step 5: Solve for x
   x = 150,100,067,756.25/243,297
6. Step 6: Final answer
   x = 616,941.71