Finding the Fourth Proportional to 1,591.17, 2,195.78 and 892.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.17 : 2,195.78 = 892.55 : x
2. Step 2: Convert to fraction form
   1,591.17/2,195.78 = 892.55/x
3. Step 3: Cross multiply
   1,591.17x = 2,195.78 × 892.55
4. Step 4: Simplify right side
   1,591.17x = 1,959,834.69
5. Step 5: Solve for x
   x = 1,959,834.69/1,591.17
6. Step 6: Final answer
   x = 1,231.69