Finding the Fourth Proportional to 7,139.40, 10,709.18 and 2,980.04

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139.40 : 10,709.18 = 2,980.04 : x
2. Step 2: Convert to fraction form
   7,139.40/10,709.18 = 2,980.04/x
3. Step 3: Cross multiply
   7,139.40x = 10,709.18 × 2,980.04
4. Step 4: Simplify right side
   7,139.40x = 31,913,784.77
5. Step 5: Solve for x
   x = 31,913,784.77/7,139.40
6. Step 6: Final answer
   x = 4,470.09