Finding the Fourth Proportional to 1,947.72, 2,687.94 and 1,557.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.72 : 2,687.94 = 1,557.58 : x
2. Step 2: Convert to fraction form
   1,947.72/2,687.94 = 1,557.58/x
3. Step 3: Cross multiply
   1,947.72x = 2,687.94 × 1,557.58
4. Step 4: Simplify right side
   1,947.72x = 4,186,681.59
5. Step 5: Solve for x
   x = 4,186,681.59/1,947.72
6. Step 6: Final answer
   x = 2,149.53