Finding the Third Proportional to 556,138 and 1,214,212

Step by Step Solution

1. Step 1: Write the proportion equation
   556,138 : 1,214,212 = 1,214,212 : x
2. Step 2: Convert to fraction form
   556,138/1,214,212 = 1,214,212/x
3. Step 3: Cross multiply
   556,138x = 1,214,212 × 1,214,212
4. Step 4: Simplify right side
   556,138x = 1,474,310,780,944
5. Step 5: Solve for x
   x = 1,474,310,780,944/556,138
6. Step 6: Final answer
   x = 2,650,980.12