Finding the Fourth Proportional to 1,591.90, 2,196.98 and 919.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.90 : 2,196.98 = 919.74 : x
2. Step 2: Convert to fraction form
   1,591.90/2,196.98 = 919.74/x
3. Step 3: Cross multiply
   1,591.90x = 2,196.98 × 919.74
4. Step 4: Simplify right side
   1,591.90x = 2,020,650.39
5. Step 5: Solve for x
   x = 2,020,650.39/1,591.90
6. Step 6: Final answer
   x = 1,269.33