Finding the Third Proportional to 247.80 and 530.72

Step by Step Solution

1. Step 1: Write the proportion equation
   247.80 : 530.72 = 530.72 : x
2. Step 2: Convert to fraction form
   247.80/530.72 = 530.72/x
3. Step 3: Cross multiply
   247.80x = 530.72 × 530.72
4. Step 4: Simplify right side
   247.80x = 281,662.39
5. Step 5: Solve for x
   x = 281,662.39/247.80
6. Step 6: Final answer
   x = 1,136.63