Finding the Fourth Proportional to 1,947.18, 2,687.11 and 1,107.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.18 : 2,687.11 = 1,107.89 : x
2. Step 2: Convert to fraction form
   1,947.18/2,687.11 = 1,107.89/x
3. Step 3: Cross multiply
   1,947.18x = 2,687.11 × 1,107.89
4. Step 4: Simplify right side
   1,947.18x = 2,977,016.17
5. Step 5: Solve for x
   x = 2,977,016.17/1,947.18
6. Step 6: Final answer
   x = 1,528.88