Finding the Fourth Proportional to 1,085.06, 1,627.59 and 315.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.06 : 1,627.59 = 315.56 : x
2. Step 2: Convert to fraction form
   1,085.06/1,627.59 = 315.56/x
3. Step 3: Cross multiply
   1,085.06x = 1,627.59 × 315.56
4. Step 4: Simplify right side
   1,085.06x = 513,607.55
5. Step 5: Solve for x
   x = 513,607.55/1,085.06
6. Step 6: Final answer
   x = 473.34