Finding the Fourth Proportional to 1,396.17, 2,090.17 and 874.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.17 : 2,090.17 = 874.50 : x
2. Step 2: Convert to fraction form
   1,396.17/2,090.17 = 874.50/x
3. Step 3: Cross multiply
   1,396.17x = 2,090.17 × 874.50
4. Step 4: Simplify right side
   1,396.17x = 1,827,846.92
5. Step 5: Solve for x
   x = 1,827,846.92/1,396.17
6. Step 6: Final answer
   x = 1,309.19