Finding the Fourth Proportional to 1,090.72, 1,636.12 and 846.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.72 : 1,636.12 = 846.48 : x
2. Step 2: Convert to fraction form
   1,090.72/1,636.12 = 846.48/x
3. Step 3: Cross multiply
   1,090.72x = 1,636.12 × 846.48
4. Step 4: Simplify right side
   1,090.72x = 1,384,942.86
5. Step 5: Solve for x
   x = 1,384,942.86/1,090.72
6. Step 6: Final answer
   x = 1,269.75