Finding the Fourth Proportional to 3,931.72, 5,876.13 and 3,620.36

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.72 : 5,876.13 = 3,620.36 : x
2. Step 2: Convert to fraction form
   3,931.72/5,876.13 = 3,620.36/x
3. Step 3: Cross multiply
   3,931.72x = 5,876.13 × 3,620.36
4. Step 4: Simplify right side
   3,931.72x = 21,273,706.01
5. Step 5: Solve for x
   x = 21,273,706.01/3,931.72
6. Step 6: Final answer
   x = 5,410.79