Finding the Third Proportional to 388,080 and 579,723.75

Step by Step Solution

1. Step 1: Write the proportion equation
   388,080 : 579,723.75 = 579,723.75 : x
2. Step 2: Convert to fraction form
   388,080/579,723.75 = 579,723.75/x
3. Step 3: Cross multiply
   388,080x = 579,723.75 × 579,723.75
4. Step 4: Simplify right side
   388,080x = 336,079,626,314.06
5. Step 5: Solve for x
   x = 336,079,626,314.06/388,080
6. Step 6: Final answer
   x = 866,006.05