Finding the Third Proportional to 239,985 and 515,585.25

Step by Step Solution

1. Step 1: Write the proportion equation
   239,985 : 515,585.25 = 515,585.25 : x
2. Step 2: Convert to fraction form
   239,985/515,585.25 = 515,585.25/x
3. Step 3: Cross multiply
   239,985x = 515,585.25 × 515,585.25
4. Step 4: Simplify right side
   239,985x = 265,828,150,017.56
5. Step 5: Solve for x
   x = 265,828,150,017.56/239,985
6. Step 6: Final answer
   x = 1,107,686.52