Finding the Third Proportional to 561,353.50 and 858,870

Step by Step Solution

1. Step 1: Write the proportion equation
   561,353.50 : 858,870 = 858,870 : x
2. Step 2: Convert to fraction form
   561,353.50/858,870 = 858,870/x
3. Step 3: Cross multiply
   561,353.50x = 858,870 × 858,870
4. Step 4: Simplify right side
   561,353.50x = 737,657,676,900
5. Step 5: Solve for x
   x = 737,657,676,900/561,353.50
6. Step 6: Final answer
   x = 1,314,069.79