Finding the Third Proportional to 144,228.50 and 315,602

Step by Step Solution

1. Step 1: Write the proportion equation
   144,228.50 : 315,602 = 315,602 : x
2. Step 2: Convert to fraction form
   144,228.50/315,602 = 315,602/x
3. Step 3: Cross multiply
   144,228.50x = 315,602 × 315,602
4. Step 4: Simplify right side
   144,228.50x = 99,604,622,404
5. Step 5: Solve for x
   x = 99,604,622,404/144,228.50
6. Step 6: Final answer
   x = 690,602.91