Finding the Third Proportional to 118,543.50 and 285,687

Step by Step Solution

1. Step 1: Write the proportion equation
   118,543.50 : 285,687 = 285,687 : x
2. Step 2: Convert to fraction form
   118,543.50/285,687 = 285,687/x
3. Step 3: Cross multiply
   118,543.50x = 285,687 × 285,687
4. Step 4: Simplify right side
   118,543.50x = 81,617,061,969
5. Step 5: Solve for x
   x = 81,617,061,969/118,543.50
6. Step 6: Final answer
   x = 688,498.84