Finding the Third Proportional to 387,768 and 820,245.75

Step by Step Solution

1. Step 1: Write the proportion equation
   387,768 : 820,245.75 = 820,245.75 : x
2. Step 2: Convert to fraction form
   387,768/820,245.75 = 820,245.75/x
3. Step 3: Cross multiply
   387,768x = 820,245.75 × 820,245.75
4. Step 4: Simplify right side
   387,768x = 672,803,090,393.06
5. Step 5: Solve for x
   x = 672,803,090,393.06/387,768
6. Step 6: Final answer
   x = 1,735,066.05