Finding the Fourth Proportional to 1,391.76, 1,908.42 and 1,345.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.76 : 1,908.42 = 1,345.18 : x
2. Step 2: Convert to fraction form
   1,391.76/1,908.42 = 1,345.18/x
3. Step 3: Cross multiply
   1,391.76x = 1,908.42 × 1,345.18
4. Step 4: Simplify right side
   1,391.76x = 2,567,168.42
5. Step 5: Solve for x
   x = 2,567,168.42/1,391.76
6. Step 6: Final answer
   x = 1,844.55