Finding the Fourth Proportional to 2,656.18, 3,980.80 and 1,094.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.18 : 3,980.80 = 1,094.40 : x
2. Step 2: Convert to fraction form
   2,656.18/3,980.80 = 1,094.40/x
3. Step 3: Cross multiply
   2,656.18x = 3,980.80 × 1,094.40
4. Step 4: Simplify right side
   2,656.18x = 4,356,582.05
5. Step 5: Solve for x
   x = 4,356,582.05/2,656.18
6. Step 6: Final answer
   x = 1,640.17