Finding the Fourth Proportional to 3,647.04, 5,031.80 and 2,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,647.04 : 5,031.80 = 2,155.12 : x
2. Step 2: Convert to fraction form
   3,647.04/5,031.80 = 2,155.12/x
3. Step 3: Cross multiply
   3,647.04x = 5,031.80 × 2,155.12
4. Step 4: Simplify right side
   3,647.04x = 10,844,132.82
5. Step 5: Solve for x
   x = 10,844,132.82/3,647.04
6. Step 6: Final answer
   x = 2,973.41