Finding the Fourth Proportional to 3,603.80, 4,973.22 and 2,111.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,603.80 : 4,973.22 = 2,111.40 : x
2. Step 2: Convert to fraction form
   3,603.80/4,973.22 = 2,111.40/x
3. Step 3: Cross multiply
   3,603.80x = 4,973.22 × 2,111.40
4. Step 4: Simplify right side
   3,603.80x = 10,500,456.71
5. Step 5: Solve for x
   x = 10,500,456.71/3,603.80
6. Step 6: Final answer
   x = 2,913.72