Finding the Fourth Proportional to 849.55, 1,172.71 and 826.15

Step by Step Solution

1. Step 1: Write the proportion equation
   849.55 : 1,172.71 = 826.15 : x
2. Step 2: Convert to fraction form
   849.55/1,172.71 = 826.15/x
3. Step 3: Cross multiply
   849.55x = 1,172.71 × 826.15
4. Step 4: Simplify right side
   849.55x = 968,828.50
5. Step 5: Solve for x
   x = 968,828.50/849.55
6. Step 6: Final answer
   x = 1,140.40