Finding the Third Proportional to 391,068 and 856,860

Step by Step Solution

1. Step 1: Write the proportion equation
   391,068 : 856,860 = 856,860 : x
2. Step 2: Convert to fraction form
   391,068/856,860 = 856,860/x
3. Step 3: Cross multiply
   391,068x = 856,860 × 856,860
4. Step 4: Simplify right side
   391,068x = 734,209,059,600
5. Step 5: Solve for x
   x = 734,209,059,600/391,068
6. Step 6: Final answer
   x = 1,877,446.02