Finding the Fourth Proportional to 1,393.71, 1,921.59 and 1,170.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.71 : 1,921.59 = 1,170.52 : x
2. Step 2: Convert to fraction form
   1,393.71/1,921.59 = 1,170.52/x
3. Step 3: Cross multiply
   1,393.71x = 1,921.59 × 1,170.52
4. Step 4: Simplify right side
   1,393.71x = 2,249,254.72
5. Step 5: Solve for x
   x = 2,249,254.72/1,393.71
6. Step 6: Final answer
   x = 1,613.87