Finding the Fourth Proportional to 1,291.94, 1,787.57 and 1,126.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.94 : 1,787.57 = 1,126.50 : x
2. Step 2: Convert to fraction form
   1,291.94/1,787.57 = 1,126.50/x
3. Step 3: Cross multiply
   1,291.94x = 1,787.57 × 1,126.50
4. Step 4: Simplify right side
   1,291.94x = 2,013,683.03
5. Step 5: Solve for x
   x = 2,013,683.03/1,291.94
6. Step 6: Final answer
   x = 1,558.65