Finding the Third Proportional to 789,990 and 1,128,900

Step by Step Solution

1. Step 1: Write the proportion equation
   789,990 : 1,128,900 = 1,128,900 : x
2. Step 2: Convert to fraction form
   789,990/1,128,900 = 1,128,900/x
3. Step 3: Cross multiply
   789,990x = 1,128,900 × 1,128,900
4. Step 4: Simplify right side
   789,990x = 1,274,415,210,000
5. Step 5: Solve for x
   x = 1,274,415,210,000/789,990
6. Step 6: Final answer
   x = 1,613,204.23