Finding the Fourth Proportional to 1,989.79, 2,746.08 and 1,105.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.79 : 2,746.08 = 1,105.57 : x
2. Step 2: Convert to fraction form
   1,989.79/2,746.08 = 1,105.57/x
3. Step 3: Cross multiply
   1,989.79x = 2,746.08 × 1,105.57
4. Step 4: Simplify right side
   1,989.79x = 3,035,983.67
5. Step 5: Solve for x
   x = 3,035,983.67/1,989.79
6. Step 6: Final answer
   x = 1,525.78