Finding the Fourth Proportional to 3,631.88, 5,012.15 and 2,139.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,631.88 : 5,012.15 = 2,139.86 : x
2. Step 2: Convert to fraction form
   3,631.88/5,012.15 = 2,139.86/x
3. Step 3: Cross multiply
   3,631.88x = 5,012.15 × 2,139.86
4. Step 4: Simplify right side
   3,631.88x = 10,725,274.24
5. Step 5: Solve for x
   x = 10,725,274.24/3,631.88
6. Step 6: Final answer
   x = 2,953.10