Finding the Fourth Proportional to 1,200.72, 1,800.12 and 470.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.72 : 1,800.12 = 470.16 : x
2. Step 2: Convert to fraction form
   1,200.72/1,800.12 = 470.16/x
3. Step 3: Cross multiply
   1,200.72x = 1,800.12 × 470.16
4. Step 4: Simplify right side
   1,200.72x = 846,344.42
5. Step 5: Solve for x
   x = 846,344.42/1,200.72
6. Step 6: Final answer
   x = 704.86