Finding the Fourth Proportional to 3,885.40, 5,796.71 and 3,699.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,885.40 : 5,796.71 = 3,699.88 : x
2. Step 2: Convert to fraction form
   3,885.40/5,796.71 = 3,699.88/x
3. Step 3: Cross multiply
   3,885.40x = 5,796.71 × 3,699.88
4. Step 4: Simplify right side
   3,885.40x = 21,447,131.39
5. Step 5: Solve for x
   x = 21,447,131.39/3,885.40
6. Step 6: Final answer
   x = 5,519.93