Finding the Third Proportional to 638,112 and 1,392,138

Step by Step Solution

1. Step 1: Write the proportion equation
   638,112 : 1,392,138 = 1,392,138 : x
2. Step 2: Convert to fraction form
   638,112/1,392,138 = 1,392,138/x
3. Step 3: Cross multiply
   638,112x = 1,392,138 × 1,392,138
4. Step 4: Simplify right side
   638,112x = 1,938,048,211,044
5. Step 5: Solve for x
   x = 1,938,048,211,044/638,112
6. Step 6: Final answer
   x = 3,037,159.95