Finding the Fourth Proportional to 1,187.56, 1,631.69 and 1,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187.56 : 1,631.69 = 1,111.72 : x
2. Step 2: Convert to fraction form
   1,187.56/1,631.69 = 1,111.72/x
3. Step 3: Cross multiply
   1,187.56x = 1,631.69 × 1,111.72
4. Step 4: Simplify right side
   1,187.56x = 1,813,982.41
5. Step 5: Solve for x
   x = 1,813,982.41/1,187.56
6. Step 6: Final answer
   x = 1,527.49