Finding the Third Proportional to 217,840 and 474,438

Step by Step Solution

1. Step 1: Write the proportion equation
   217,840 : 474,438 = 474,438 : x
2. Step 2: Convert to fraction form
   217,840/474,438 = 474,438/x
3. Step 3: Cross multiply
   217,840x = 474,438 × 474,438
4. Step 4: Simplify right side
   217,840x = 225,091,415,844
5. Step 5: Solve for x
   x = 225,091,415,844/217,840
6. Step 6: Final answer
   x = 1,033,287.81