Finding the Fourth Proportional to 3,455.82, 5,171.34 and 1,987.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,455.82 : 5,171.34 = 1,987.77 : x
2. Step 2: Convert to fraction form
   3,455.82/5,171.34 = 1,987.77/x
3. Step 3: Cross multiply
   3,455.82x = 5,171.34 × 1,987.77
4. Step 4: Simplify right side
   3,455.82x = 10,279,434.51
5. Step 5: Solve for x
   x = 10,279,434.51/3,455.82
6. Step 6: Final answer
   x = 2,974.53