Finding the Third Proportional to 386,389.50 and 591,090

Step by Step Solution

1. Step 1: Write the proportion equation
   386,389.50 : 591,090 = 591,090 : x
2. Step 2: Convert to fraction form
   386,389.50/591,090 = 591,090/x
3. Step 3: Cross multiply
   386,389.50x = 591,090 × 591,090
4. Step 4: Simplify right side
   386,389.50x = 349,387,388,100
5. Step 5: Solve for x
   x = 349,387,388,100/386,389.50
6. Step 6: Final answer
   x = 904,236.24