Finding the Fourth Proportional to 7,111.13, 10,666.25 and 2,180.39

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.13 : 10,666.25 = 2,180.39 : x
2. Step 2: Convert to fraction form
   7,111.13/10,666.25 = 2,180.39/x
3. Step 3: Cross multiply
   7,111.13x = 10,666.25 × 2,180.39
4. Step 4: Simplify right side
   7,111.13x = 23,256,528.78
5. Step 5: Solve for x
   x = 23,256,528.78/7,111.13
6. Step 6: Final answer
   x = 3,270.44