Finding the Fourth Proportional to 1,091.05, 1,528.55 and 1,091.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.05 : 1,528.55 = 1,091.05 : x
2. Step 2: Convert to fraction form
   1,091.05/1,528.55 = 1,091.05/x
3. Step 3: Cross multiply
   1,091.05x = 1,528.55 × 1,091.05
4. Step 4: Simplify right side
   1,091.05x = 1,667,724.48
5. Step 5: Solve for x
   x = 1,667,724.48/1,091.05
6. Step 6: Final answer
   x = 1,528.55