Finding the Fourth Proportional to 1,928.86, 2,662.07 and 1,089.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.86 : 2,662.07 = 1,089.60 : x
2. Step 2: Convert to fraction form
   1,928.86/2,662.07 = 1,089.60/x
3. Step 3: Cross multiply
   1,928.86x = 2,662.07 × 1,089.60
4. Step 4: Simplify right side
   1,928.86x = 2,900,591.02
5. Step 5: Solve for x
   x = 2,900,591.02/1,928.86
6. Step 6: Final answer
   x = 1,503.78