Finding the Third Proportional to 420,639 and 925,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,639 : 925,390.50 = 925,390.50 : x
2. Step 2: Convert to fraction form
   420,639/925,390.50 = 925,390.50/x
3. Step 3: Cross multiply
   420,639x = 925,390.50 × 925,390.50
4. Step 4: Simplify right side
   420,639x = 856,347,577,490.25
5. Step 5: Solve for x
   x = 856,347,577,490.25/420,639
6. Step 6: Final answer
   x = 2,035,825.44