Finding the Fourth Proportional to 3,420.69, 5,131.14 and 1,080.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.69 : 5,131.14 = 1,080.72 : x
2. Step 2: Convert to fraction form
   3,420.69/5,131.14 = 1,080.72/x
3. Step 3: Cross multiply
   3,420.69x = 5,131.14 × 1,080.72
4. Step 4: Simplify right side
   3,420.69x = 5,545,325.62
5. Step 5: Solve for x
   x = 5,545,325.62/3,420.69
6. Step 6: Final answer
   x = 1,621.11