Finding the Third Proportional to 129,399 and 282,787.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,399 : 282,787.50 = 282,787.50 : x
2. Step 2: Convert to fraction form
   129,399/282,787.50 = 282,787.50/x
3. Step 3: Cross multiply
   129,399x = 282,787.50 × 282,787.50
4. Step 4: Simplify right side
   129,399x = 79,968,770,156.25
5. Step 5: Solve for x
   x = 79,968,770,156.25/129,399
6. Step 6: Final answer
   x = 618,001.45