Finding the Fourth Proportional to 1,091.31, 1,627.76 and 927.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.31 : 1,627.76 = 927.15 : x
2. Step 2: Convert to fraction form
   1,091.31/1,627.76 = 927.15/x
3. Step 3: Cross multiply
   1,091.31x = 1,627.76 × 927.15
4. Step 4: Simplify right side
   1,091.31x = 1,509,173.05
5. Step 5: Solve for x
   x = 1,509,173.05/1,091.31
6. Step 6: Final answer
   x = 1,382.90