Finding the Fourth Proportional to 1,071.55, 1,608.18 and 919.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.55 : 1,608.18 = 919.27 : x
2. Step 2: Convert to fraction form
   1,071.55/1,608.18 = 919.27/x
3. Step 3: Cross multiply
   1,071.55x = 1,608.18 × 919.27
4. Step 4: Simplify right side
   1,071.55x = 1,478,351.63
5. Step 5: Solve for x
   x = 1,478,351.63/1,071.55
6. Step 6: Final answer
   x = 1,379.64