Finding the Fourth Proportional to 1,991.12, 2,747.72 and 1,106.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.12 : 2,747.72 = 1,106.86 : x
2. Step 2: Convert to fraction form
   1,991.12/2,747.72 = 1,106.86/x
3. Step 3: Cross multiply
   1,991.12x = 2,747.72 × 1,106.86
4. Step 4: Simplify right side
   1,991.12x = 3,041,341.36
5. Step 5: Solve for x
   x = 3,041,341.36/1,991.12
6. Step 6: Final answer
   x = 1,527.45