Finding the Third Proportional to 258,021 and 607,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,021 : 607,099.50 = 607,099.50 : x
2. Step 2: Convert to fraction form
   258,021/607,099.50 = 607,099.50/x
3. Step 3: Cross multiply
   258,021x = 607,099.50 × 607,099.50
4. Step 4: Simplify right side
   258,021x = 368,569,802,900.25
5. Step 5: Solve for x
   x = 368,569,802,900.25/258,021
6. Step 6: Final answer
   x = 1,428,448.86