Finding the Fourth Proportional to 3,699.05, 5,101.31 and 2,891.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.05 : 5,101.31 = 2,891.61 : x
2. Step 2: Convert to fraction form
   3,699.05/5,101.31 = 2,891.61/x
3. Step 3: Cross multiply
   3,699.05x = 5,101.31 × 2,891.61
4. Step 4: Simplify right side
   3,699.05x = 14,751,018.14
5. Step 5: Solve for x
   x = 14,751,018.14/3,699.05
6. Step 6: Final answer
   x = 3,987.78