Finding the Fourth Proportional to 13,820.01, 20,729.94 and 3,431.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.01 : 20,729.94 = 3,431.76 : x
2. Step 2: Convert to fraction form
   13,820.01/20,729.94 = 3,431.76/x
3. Step 3: Cross multiply
   13,820.01x = 20,729.94 × 3,431.76
4. Step 4: Simplify right side
   13,820.01x = 71,140,178.89
5. Step 5: Solve for x
   x = 71,140,178.89/13,820.01
6. Step 6: Final answer
   x = 5,147.62