Finding the Third Proportional to 386,818.50 and 591,345

Step by Step Solution

1. Step 1: Write the proportion equation
   386,818.50 : 591,345 = 591,345 : x
2. Step 2: Convert to fraction form
   386,818.50/591,345 = 591,345/x
3. Step 3: Cross multiply
   386,818.50x = 591,345 × 591,345
4. Step 4: Simplify right side
   386,818.50x = 349,688,909,025
5. Step 5: Solve for x
   x = 349,688,909,025/386,818.50
6. Step 6: Final answer
   x = 904,012.89