Finding the Third Proportional to 666,400 and 1,451,120

Step by Step Solution

1. Step 1: Write the proportion equation
   666,400 : 1,451,120 = 1,451,120 : x
2. Step 2: Convert to fraction form
   666,400/1,451,120 = 1,451,120/x
3. Step 3: Cross multiply
   666,400x = 1,451,120 × 1,451,120
4. Step 4: Simplify right side
   666,400x = 2,105,749,254,400
5. Step 5: Solve for x
   x = 2,105,749,254,400/666,400
6. Step 6: Final answer
   x = 3,159,887.84