Finding the Third Proportional to 621,711 and 988,612.50

Step by Step Solution

1. Step 1: Write the proportion equation
   621,711 : 988,612.50 = 988,612.50 : x
2. Step 2: Convert to fraction form
   621,711/988,612.50 = 988,612.50/x
3. Step 3: Cross multiply
   621,711x = 988,612.50 × 988,612.50
4. Step 4: Simplify right side
   621,711x = 977,354,675,156.25
5. Step 5: Solve for x
   x = 977,354,675,156.25/621,711
6. Step 6: Final answer
   x = 1,572,040.18