Finding the Fourth Proportional to 1,091.10, 1,628.72 and 1,011

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.10 : 1,628.72 = 1,011 : x
2. Step 2: Convert to fraction form
   1,091.10/1,628.72 = 1,011/x
3. Step 3: Cross multiply
   1,091.10x = 1,628.72 × 1,011
4. Step 4: Simplify right side
   1,091.10x = 1,646,635.92
5. Step 5: Solve for x
   x = 1,646,635.92/1,091.10
6. Step 6: Final answer
   x = 1,509.15