Finding the Fourth Proportional to 1,094.34, 1,640.69 and 661.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,094.34 : 1,640.69 = 661.39 : x
2. Step 2: Convert to fraction form
   1,094.34/1,640.69 = 661.39/x
3. Step 3: Cross multiply
   1,094.34x = 1,640.69 × 661.39
4. Step 4: Simplify right side
   1,094.34x = 1,085,135.96
5. Step 5: Solve for x
   x = 1,085,135.96/1,094.34
6. Step 6: Final answer
   x = 991.59