Finding the Fourth Proportional to 3,645.54, 5,031.59 and 2,153.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,645.54 : 5,031.59 = 2,153.39 : x
2. Step 2: Convert to fraction form
   3,645.54/5,031.59 = 2,153.39/x
3. Step 3: Cross multiply
   3,645.54x = 5,031.59 × 2,153.39
4. Step 4: Simplify right side
   3,645.54x = 10,834,939.67
5. Step 5: Solve for x
   x = 10,834,939.67/3,645.54
6. Step 6: Final answer
   x = 2,972.11