Finding the Fourth Proportional to 1,355.31, 2,023.16 and 1,191.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.31 : 2,023.16 = 1,191.29 : x
2. Step 2: Convert to fraction form
   1,355.31/2,023.16 = 1,191.29/x
3. Step 3: Cross multiply
   1,355.31x = 2,023.16 × 1,191.29
4. Step 4: Simplify right side
   1,355.31x = 2,410,154.20
5. Step 5: Solve for x
   x = 2,410,154.20/1,355.31
6. Step 6: Final answer
   x = 1,778.30