Finding the Fourth Proportional to 12,856.72, 19,280.94 and 4,089.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.72 : 19,280.94 = 4,089.58 : x
2. Step 2: Convert to fraction form
   12,856.72/19,280.94 = 4,089.58/x
3. Step 3: Cross multiply
   12,856.72x = 19,280.94 × 4,089.58
4. Step 4: Simplify right side
   12,856.72x = 78,850,946.61
5. Step 5: Solve for x
   x = 78,850,946.61/12,856.72
6. Step 6: Final answer
   x = 6,133.05