Finding the Fourth Proportional to 1,311.32, 1,809.06 and 1,111.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.32 : 1,809.06 = 1,111.30 : x
2. Step 2: Convert to fraction form
   1,311.32/1,809.06 = 1,111.30/x
3. Step 3: Cross multiply
   1,311.32x = 1,809.06 × 1,111.30
4. Step 4: Simplify right side
   1,311.32x = 2,010,408.38
5. Step 5: Solve for x
   x = 2,010,408.38/1,311.32
6. Step 6: Final answer
   x = 1,533.12