Finding the Third Proportional to 3,120.50 and 4,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,120.50 : 4,700.50 = 4,700.50 : x
2. Step 2: Convert to fraction form
   3,120.50/4,700.50 = 4,700.50/x
3. Step 3: Cross multiply
   3,120.50x = 4,700.50 × 4,700.50
4. Step 4: Simplify right side
   3,120.50x = 22,094,700.25
5. Step 5: Solve for x
   x = 22,094,700.25/3,120.50
6. Step 6: Final answer
   x = 7,080.50