Finding the Fourth Proportional to 3,647.07, 5,031.81 and 2,155.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,647.07 : 5,031.81 = 2,155.51 : x
2. Step 2: Convert to fraction form
   3,647.07/5,031.81 = 2,155.51/x
3. Step 3: Cross multiply
   3,647.07x = 5,031.81 × 2,155.51
4. Step 4: Simplify right side
   3,647.07x = 10,846,116.77
5. Step 5: Solve for x
   x = 10,846,116.77/3,647.07
6. Step 6: Final answer
   x = 2,973.93