Finding the Fourth Proportional to 1,105.68, 1,536.53 and 1,091.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.68 : 1,536.53 = 1,091.91 : x
2. Step 2: Convert to fraction form
   1,105.68/1,536.53 = 1,091.91/x
3. Step 3: Cross multiply
   1,105.68x = 1,536.53 × 1,091.91
4. Step 4: Simplify right side
   1,105.68x = 1,677,755.20
5. Step 5: Solve for x
   x = 1,677,755.20/1,105.68
6. Step 6: Final answer
   x = 1,517.40