Finding the Fourth Proportional to 1,091.72, 1,627.57 and 1,018.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.72 : 1,627.57 = 1,018.76 : x
2. Step 2: Convert to fraction form
   1,091.72/1,627.57 = 1,018.76/x
3. Step 3: Cross multiply
   1,091.72x = 1,627.57 × 1,018.76
4. Step 4: Simplify right side
   1,091.72x = 1,658,103.21
5. Step 5: Solve for x
   x = 1,658,103.21/1,091.72
6. Step 6: Final answer
   x = 1,518.80