Finding the Fourth Proportional to 13,380.27, 20,070.45 and 3,518.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.27 : 20,070.45 = 3,518.72 : x
2. Step 2: Convert to fraction form
   13,380.27/20,070.45 = 3,518.72/x
3. Step 3: Cross multiply
   13,380.27x = 20,070.45 × 3,518.72
4. Step 4: Simplify right side
   13,380.27x = 70,622,293.82
5. Step 5: Solve for x
   x = 70,622,293.82/13,380.27
6. Step 6: Final answer
   x = 5,278.09