Finding the Fourth Proportional to 3,858.22, 5,311.47 and 3,681.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858.22 : 5,311.47 = 3,681.91 : x
2. Step 2: Convert to fraction form
   3,858.22/5,311.47 = 3,681.91/x
3. Step 3: Cross multiply
   3,858.22x = 5,311.47 × 3,681.91
4. Step 4: Simplify right side
   3,858.22x = 19,556,354.51
5. Step 5: Solve for x
   x = 19,556,354.51/3,858.22
6. Step 6: Final answer
   x = 5,068.75