Finding the Fourth Proportional to 1,148.73, 1,720.31 and 1,091.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,148.73 : 1,720.31 = 1,091.31 : x
2. Step 2: Convert to fraction form
   1,148.73/1,720.31 = 1,091.31/x
3. Step 3: Cross multiply
   1,148.73x = 1,720.31 × 1,091.31
4. Step 4: Simplify right side
   1,148.73x = 1,877,386.05
5. Step 5: Solve for x
   x = 1,877,386.05/1,148.73
6. Step 6: Final answer
   x = 1,634.31