Finding the Third Proportional to 172,005.75 and 388,603.88

Step by Step Solution

1. Step 1: Write the proportion equation
   172,005.75 : 388,603.88 = 388,603.88 : x
2. Step 2: Convert to fraction form
   172,005.75/388,603.88 = 388,603.88/x
3. Step 3: Cross multiply
   172,005.75x = 388,603.88 × 388,603.88
4. Step 4: Simplify right side
   172,005.75x = 151,012,971,665.02
5. Step 5: Solve for x
   x = 151,012,971,665.02/172,005.75
6. Step 6: Final answer
   x = 877,953.04