Finding the Fourth Proportional to 7,111.30, 10,665.72 and 3,214.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.30 : 10,665.72 = 3,214.80 : x
2. Step 2: Convert to fraction form
   7,111.30/10,665.72 = 3,214.80/x
3. Step 3: Cross multiply
   7,111.30x = 10,665.72 × 3,214.80
4. Step 4: Simplify right side
   7,111.30x = 34,288,156.66
5. Step 5: Solve for x
   x = 34,288,156.66/7,111.30
6. Step 6: Final answer
   x = 4,821.64