Finding the Third Proportional to 420,648.19 and 912,647.25

Step by Step Solution

1. Step 1: Write the proportion equation
   420,648.19 : 912,647.25 = 912,647.25 : x
2. Step 2: Convert to fraction form
   420,648.19/912,647.25 = 912,647.25/x
3. Step 3: Cross multiply
   420,648.19x = 912,647.25 × 912,647.25
4. Step 4: Simplify right side
   420,648.19x = 832,925,002,932.56
5. Step 5: Solve for x
   x = 832,925,002,932.56/420,648.19
6. Step 6: Final answer
   x = 1,980,098.88