Finding the Third Proportional to 387,900 and 605,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,900 : 605,422.50 = 605,422.50 : x
2. Step 2: Convert to fraction form
   387,900/605,422.50 = 605,422.50/x
3. Step 3: Cross multiply
   387,900x = 605,422.50 × 605,422.50
4. Step 4: Simplify right side
   387,900x = 366,536,403,506.25
5. Step 5: Solve for x
   x = 366,536,403,506.25/387,900
6. Step 6: Final answer
   x = 944,924.99