Finding the Third Proportional to 215,254 and 424,988

Step by Step Solution

1. Step 1: Write the proportion equation
   215,254 : 424,988 = 424,988 : x
2. Step 2: Convert to fraction form
   215,254/424,988 = 424,988/x
3. Step 3: Cross multiply
   215,254x = 424,988 × 424,988
4. Step 4: Simplify right side
   215,254x = 180,614,800,144
5. Step 5: Solve for x
   x = 180,614,800,144/215,254
6. Step 6: Final answer
   x = 839,077.56