Finding the Fourth Proportional to 1,833.12, 2,528.78 and 1,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,833.12 : 2,528.78 = 1,086.72 : x
2. Step 2: Convert to fraction form
   1,833.12/2,528.78 = 1,086.72/x
3. Step 3: Cross multiply
   1,833.12x = 2,528.78 × 1,086.72
4. Step 4: Simplify right side
   1,833.12x = 2,748,070.37
5. Step 5: Solve for x
   x = 2,748,070.37/1,833.12
6. Step 6: Final answer
   x = 1,499.12