Finding the Fourth Proportional to 1,928.88, 2,662.07 and 1,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.88 : 2,662.07 = 1,089.72 : x
2. Step 2: Convert to fraction form
   1,928.88/2,662.07 = 1,089.72/x
3. Step 3: Cross multiply
   1,928.88x = 2,662.07 × 1,089.72
4. Step 4: Simplify right side
   1,928.88x = 2,900,905.47
5. Step 5: Solve for x
   x = 2,900,905.47/1,928.88
6. Step 6: Final answer
   x = 1,503.93