Finding the Fourth Proportional to 1,392.86, 2,089.32 and 1,104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.86 : 2,089.32 = 1,104.50 : x
2. Step 2: Convert to fraction form
   1,392.86/2,089.32 = 1,104.50/x
3. Step 3: Cross multiply
   1,392.86x = 2,089.32 × 1,104.50
4. Step 4: Simplify right side
   1,392.86x = 2,307,653.94
5. Step 5: Solve for x
   x = 2,307,653.94/1,392.86
6. Step 6: Final answer
   x = 1,656.77