Finding the Third Proportional to 162,390 and 243,342

Step by Step Solution

1. Step 1: Write the proportion equation
   162,390 : 243,342 = 243,342 : x
2. Step 2: Convert to fraction form
   162,390/243,342 = 243,342/x
3. Step 3: Cross multiply
   162,390x = 243,342 × 243,342
4. Step 4: Simplify right side
   162,390x = 59,215,328,964
5. Step 5: Solve for x
   x = 59,215,328,964/162,390
6. Step 6: Final answer
   x = 364,648.86