Finding the Fourth Proportional to 6,419.34, 8,856.09 and 3,900.51

Step by Step Solution

1. Step 1: Write the proportion equation
   6,419.34 : 8,856.09 = 3,900.51 : x
2. Step 2: Convert to fraction form
   6,419.34/8,856.09 = 3,900.51/x
3. Step 3: Cross multiply
   6,419.34x = 8,856.09 × 3,900.51
4. Step 4: Simplify right side
   6,419.34x = 34,543,267.61
5. Step 5: Solve for x
   x = 34,543,267.61/6,419.34
6. Step 6: Final answer
   x = 5,381.12