Finding the Fourth Proportional to 7,109.72, 10,661.06 and 2,178.17

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.72 : 10,661.06 = 2,178.17 : x
2. Step 2: Convert to fraction form
   7,109.72/10,661.06 = 2,178.17/x
3. Step 3: Cross multiply
   7,109.72x = 10,661.06 × 2,178.17
4. Step 4: Simplify right side
   7,109.72x = 23,221,547.75
5. Step 5: Solve for x
   x = 23,221,547.75/7,109.72
6. Step 6: Final answer
   x = 3,266.17