Finding the Third Proportional to 402,391 and 603,634.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,391 : 603,634.50 = 603,634.50 : x
2. Step 2: Convert to fraction form
   402,391/603,634.50 = 603,634.50/x
3. Step 3: Cross multiply
   402,391x = 603,634.50 × 603,634.50
4. Step 4: Simplify right side
   402,391x = 364,374,609,590.25
5. Step 5: Solve for x
   x = 364,374,609,590.25/402,391
6. Step 6: Final answer
   x = 905,523.76