Finding the Third Proportional to 258,051.75 and 607,144.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,051.75 : 607,144.50 = 607,144.50 : x
2. Step 2: Convert to fraction form
   258,051.75/607,144.50 = 607,144.50/x
3. Step 3: Cross multiply
   258,051.75x = 607,144.50 × 607,144.50
4. Step 4: Simplify right side
   258,051.75x = 368,624,443,880.25
5. Step 5: Solve for x
   x = 368,624,443,880.25/258,051.75
6. Step 6: Final answer
   x = 1,428,490.39