Finding the Fourth Proportional to 1,047.21, 1,570.72 and 636.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.21 : 1,570.72 = 636.22 : x
2. Step 2: Convert to fraction form
   1,047.21/1,570.72 = 636.22/x
3. Step 3: Cross multiply
   1,047.21x = 1,570.72 × 636.22
4. Step 4: Simplify right side
   1,047.21x = 999,323.48
5. Step 5: Solve for x
   x = 999,323.48/1,047.21
6. Step 6: Final answer
   x = 954.27