Finding the Fourth Proportional to 1,047.47, 1,570.72 and 316.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.47 : 1,570.72 = 316.91 : x
2. Step 2: Convert to fraction form
   1,047.47/1,570.72 = 316.91/x
3. Step 3: Cross multiply
   1,047.47x = 1,570.72 × 316.91
4. Step 4: Simplify right side
   1,047.47x = 497,776.88
5. Step 5: Solve for x
   x = 497,776.88/1,047.47
6. Step 6: Final answer
   x = 475.22