Finding the Fourth Proportional to 3,926.84, 5,419.16 and 2,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,926.84 : 5,419.16 = 2,158.50 : x
2. Step 2: Convert to fraction form
   3,926.84/5,419.16 = 2,158.50/x
3. Step 3: Cross multiply
   3,926.84x = 5,419.16 × 2,158.50
4. Step 4: Simplify right side
   3,926.84x = 11,697,256.86
5. Step 5: Solve for x
   x = 11,697,256.86/3,926.84
6. Step 6: Final answer
   x = 2,978.80