Finding the Third Proportional to 638,164 and 1,381,992

Step by Step Solution

1. Step 1: Write the proportion equation
   638,164 : 1,381,992 = 1,381,992 : x
2. Step 2: Convert to fraction form
   638,164/1,381,992 = 1,381,992/x
3. Step 3: Cross multiply
   638,164x = 1,381,992 × 1,381,992
4. Step 4: Simplify right side
   638,164x = 1,909,901,888,064
5. Step 5: Solve for x
   x = 1,909,901,888,064/638,164
6. Step 6: Final answer
   x = 2,992,807.32