Finding the Fourth Proportional to 1,760.56, 2,641.80 and 991.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,760.56 : 2,641.80 = 991.12 : x
2. Step 2: Convert to fraction form
   1,760.56/2,641.80 = 991.12/x
3. Step 3: Cross multiply
   1,760.56x = 2,641.80 × 991.12
4. Step 4: Simplify right side
   1,760.56x = 2,618,340.82
5. Step 5: Solve for x
   x = 2,618,340.82/1,760.56
6. Step 6: Final answer
   x = 1,487.22