Finding the Fourth Proportional to 890.94, 1,225.89 and 869.34

Step by Step Solution

1. Step 1: Write the proportion equation
   890.94 : 1,225.89 = 869.34 : x
2. Step 2: Convert to fraction form
   890.94/1,225.89 = 869.34/x
3. Step 3: Cross multiply
   890.94x = 1,225.89 × 869.34
4. Step 4: Simplify right side
   890.94x = 1,065,715.21
5. Step 5: Solve for x
   x = 1,065,715.21/890.94
6. Step 6: Final answer
   x = 1,196.17