Finding the Fourth Proportional to 1,091.72, 1,637.57 and 270.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.72 : 1,637.57 = 270.00 : x
2. Step 2: Convert to fraction form
   1,091.72/1,637.57 = 270.00/x
3. Step 3: Cross multiply
   1,091.72x = 1,637.57 × 270.00
4. Step 4: Simplify right side
   1,091.72x = 442,150.72
5. Step 5: Solve for x
   x = 442,150.72/1,091.72
6. Step 6: Final answer
   x = 405.00