Finding the Fourth Proportional to 7,003.80, 10,507.20 and 3,109.32

Step by Step Solution

1. Step 1: Write the proportion equation
   7,003.80 : 10,507.20 = 3,109.32 : x
2. Step 2: Convert to fraction form
   7,003.80/10,507.20 = 3,109.32/x
3. Step 3: Cross multiply
   7,003.80x = 10,507.20 × 3,109.32
4. Step 4: Simplify right side
   7,003.80x = 32,670,247.10
5. Step 5: Solve for x
   x = 32,670,247.10/7,003.80
6. Step 6: Final answer
   x = 4,664.65