Finding the Third Proportional to 300,840 and 653,551.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,840 : 653,551.50 = 653,551.50 : x
2. Step 2: Convert to fraction form
   300,840/653,551.50 = 653,551.50/x
3. Step 3: Cross multiply
   300,840x = 653,551.50 × 653,551.50
4. Step 4: Simplify right side
   300,840x = 427,129,563,152.25
5. Step 5: Solve for x
   x = 427,129,563,152.25/300,840
6. Step 6: Final answer
   x = 1,419,789.80