Finding the Fourth Proportional to 14,280.30, 21,428.55 and 5,515.83

Step by Step Solution

1. Step 1: Write the proportion equation
   14,280.30 : 21,428.55 = 5,515.83 : x
2. Step 2: Convert to fraction form
   14,280.30/21,428.55 = 5,515.83/x
3. Step 3: Cross multiply
   14,280.30x = 21,428.55 × 5,515.83
4. Step 4: Simplify right side
   14,280.30x = 118,196,238.95
5. Step 5: Solve for x
   x = 118,196,238.95/14,280.30
6. Step 6: Final answer
   x = 8,276.87