Finding the Fourth Proportional to 1,591.59, 2,197.69 and 994.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.59 : 2,197.69 = 994.78 : x
2. Step 2: Convert to fraction form
   1,591.59/2,197.69 = 994.78/x
3. Step 3: Cross multiply
   1,591.59x = 2,197.69 × 994.78
4. Step 4: Simplify right side
   1,591.59x = 2,186,213.08
5. Step 5: Solve for x
   x = 2,186,213.08/1,591.59
6. Step 6: Final answer
   x = 1,373.60