Finding the Fourth Proportional to 1,109.81, 1,528.38 and 1,106.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.81 : 1,528.38 = 1,106.47 : x
2. Step 2: Convert to fraction form
   1,109.81/1,528.38 = 1,106.47/x
3. Step 3: Cross multiply
   1,109.81x = 1,528.38 × 1,106.47
4. Step 4: Simplify right side
   1,109.81x = 1,691,106.62
5. Step 5: Solve for x
   x = 1,691,106.62/1,109.81
6. Step 6: Final answer
   x = 1,523.78