Finding the Third Proportional to 42.40 and 100.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42.40 : 100.30 = 100.30 : x
2. Step 2: Convert to fraction form
   42.40/100.30 = 100.30/x
3. Step 3: Cross multiply
   42.40x = 100.30 × 100.30
4. Step 4: Simplify right side
   42.40x = 10,060.25
5. Step 5: Solve for x
   x = 10,060.25/42.40
6. Step 6: Final answer
   x = 237.28