Finding the Third Proportional to 388,759.50 and 580,142.25

Step by Step Solution

1. Step 1: Write the proportion equation
   388,759.50 : 580,142.25 = 580,142.25 : x
2. Step 2: Convert to fraction form
   388,759.50/580,142.25 = 580,142.25/x
3. Step 3: Cross multiply
   388,759.50x = 580,142.25 × 580,142.25
4. Step 4: Simplify right side
   388,759.50x = 336,565,030,235.06
5. Step 5: Solve for x
   x = 336,565,030,235.06/388,759.50
6. Step 6: Final answer
   x = 865,740.98