Finding the Fourth Proportional to 1,047.72, 1,570.86 and 470.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.72 : 1,570.86 = 470.28 : x
2. Step 2: Convert to fraction form
   1,047.72/1,570.86 = 470.28/x
3. Step 3: Cross multiply
   1,047.72x = 1,570.86 × 470.28
4. Step 4: Simplify right side
   1,047.72x = 738,744.04
5. Step 5: Solve for x
   x = 738,744.04/1,047.72
6. Step 6: Final answer
   x = 705.10