Finding the Third Proportional to 402,705 and 609,133.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,705 : 609,133.50 = 609,133.50 : x
2. Step 2: Convert to fraction form
   402,705/609,133.50 = 609,133.50/x
3. Step 3: Cross multiply
   402,705x = 609,133.50 × 609,133.50
4. Step 4: Simplify right side
   402,705x = 371,043,620,822.25
5. Step 5: Solve for x
   x = 371,043,620,822.25/402,705
6. Step 6: Final answer
   x = 921,378.23