Finding the Fourth Proportional to 1,047.16, 1,570.80 and 316.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.16 : 1,570.80 = 316.72 : x
2. Step 2: Convert to fraction form
   1,047.16/1,570.80 = 316.72/x
3. Step 3: Cross multiply
   1,047.16x = 1,570.80 × 316.72
4. Step 4: Simplify right side
   1,047.16x = 497,498.27
5. Step 5: Solve for x
   x = 497,498.27/1,047.16
6. Step 6: Final answer
   x = 475.09