Finding the Third Proportional to 620,745 and 991,789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   620,745 : 991,789.50 = 991,789.50 : x
2. Step 2: Convert to fraction form
   620,745/991,789.50 = 991,789.50/x
3. Step 3: Cross multiply
   620,745x = 991,789.50 × 991,789.50
4. Step 4: Simplify right side
   620,745x = 983,646,412,310.25
5. Step 5: Solve for x
   x = 983,646,412,310.25/620,745
6. Step 6: Final answer
   x = 1,584,622.37