Finding the Third Proportional to 258,120 and 607,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,120 : 607,291.50 = 607,291.50 : x
2. Step 2: Convert to fraction form
   258,120/607,291.50 = 607,291.50/x
3. Step 3: Cross multiply
   258,120x = 607,291.50 × 607,291.50
4. Step 4: Simplify right side
   258,120x = 368,802,965,972.25
5. Step 5: Solve for x
   x = 368,802,965,972.25/258,120
6. Step 6: Final answer
   x = 1,428,804.30