Finding the Fourth Proportional to 12,858.85, 19,284.90 and 5,459.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858.85 : 19,284.90 = 5,459.50 : x
2. Step 2: Convert to fraction form
   12,858.85/19,284.90 = 5,459.50/x
3. Step 3: Cross multiply
   12,858.85x = 19,284.90 × 5,459.50
4. Step 4: Simplify right side
   12,858.85x = 105,285,911.55
5. Step 5: Solve for x
   x = 105,285,911.55/12,858.85
6. Step 6: Final answer
   x = 8,187.82