Finding the Third Proportional to 156.18 and 238.40

Step by Step Solution

1. Step 1: Write the proportion equation
   156.18 : 238.40 = 238.40 : x
2. Step 2: Convert to fraction form
   156.18/238.40 = 238.40/x
3. Step 3: Cross multiply
   156.18x = 238.40 × 238.40
4. Step 4: Simplify right side
   156.18x = 56,835.62
5. Step 5: Solve for x
   x = 56,835.62/156.18
6. Step 6: Final answer
   x = 363.92