Finding the Third Proportional to 611,413 and 815,437.50

Step by Step Solution

1. Step 1: Write the proportion equation
   611,413 : 815,437.50 = 815,437.50 : x
2. Step 2: Convert to fraction form
   611,413/815,437.50 = 815,437.50/x
3. Step 3: Cross multiply
   611,413x = 815,437.50 × 815,437.50
4. Step 4: Simplify right side
   611,413x = 664,938,316,406.25
5. Step 5: Solve for x
   x = 664,938,316,406.25/611,413
6. Step 6: Final answer
   x = 1,087,543.63