Finding the Fourth Proportional to 1,393.91, 2,089.24 and 1,378.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.91 : 2,089.24 = 1,378.52 : x
2. Step 2: Convert to fraction form
   1,393.91/2,089.24 = 1,378.52/x
3. Step 3: Cross multiply
   1,393.91x = 2,089.24 × 1,378.52
4. Step 4: Simplify right side
   1,393.91x = 2,880,059.12
5. Step 5: Solve for x
   x = 2,880,059.12/1,393.91
6. Step 6: Final answer
   x = 2,066.17