Finding the Fourth Proportional to 1,947.80, 2,687.78 and 1,151.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.80 : 2,687.78 = 1,151.16 : x
2. Step 2: Convert to fraction form
   1,947.80/2,687.78 = 1,151.16/x
3. Step 3: Cross multiply
   1,947.80x = 2,687.78 × 1,151.16
4. Step 4: Simplify right side
   1,947.80x = 3,094,059.07
5. Step 5: Solve for x
   x = 3,094,059.07/1,947.80
6. Step 6: Final answer
   x = 1,588.49