Finding the Fourth Proportional to 3,686.76, 5,529.78 and 1,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.76 : 5,529.78 = 1,089.72 : x
2. Step 2: Convert to fraction form
   3,686.76/5,529.78 = 1,089.72/x
3. Step 3: Cross multiply
   3,686.76x = 5,529.78 × 1,089.72
4. Step 4: Simplify right side
   3,686.76x = 6,025,911.86
5. Step 5: Solve for x
   x = 6,025,911.86/3,686.76
6. Step 6: Final answer
   x = 1,634.47