Finding the Fourth Proportional to 3,925.07, 5,416.72 and 2,156.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,925.07 : 5,416.72 = 2,156.71 : x
2. Step 2: Convert to fraction form
   3,925.07/5,416.72 = 2,156.71/x
3. Step 3: Cross multiply
   3,925.07x = 5,416.72 × 2,156.71
4. Step 4: Simplify right side
   3,925.07x = 11,682,294.19
5. Step 5: Solve for x
   x = 11,682,294.19/3,925.07
6. Step 6: Final answer
   x = 2,976.33