Finding the Fourth Proportional to 1,131.35, 1,561.28 and 627.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.35 : 1,561.28 = 627.22 : x
2. Step 2: Convert to fraction form
   1,131.35/1,561.28 = 627.22/x
3. Step 3: Cross multiply
   1,131.35x = 1,561.28 × 627.22
4. Step 4: Simplify right side
   1,131.35x = 979,259.00
5. Step 5: Solve for x
   x = 979,259.00/1,131.35
6. Step 6: Final answer
   x = 865.56