Finding the Third Proportional to 386,394 and 591,064.50

Step by Step Solution

1. Step 1: Write the proportion equation
   386,394 : 591,064.50 = 591,064.50 : x
2. Step 2: Convert to fraction form
   386,394/591,064.50 = 591,064.50/x
3. Step 3: Cross multiply
   386,394x = 591,064.50 × 591,064.50
4. Step 4: Simplify right side
   386,394x = 349,357,243,160.25
5. Step 5: Solve for x
   x = 349,357,243,160.25/386,394
6. Step 6: Final answer
   x = 904,147.69