Finding the Fourth Proportional to 12,684.63, 19,023.86 and 5,285.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.63 : 19,023.86 = 5,285.05 : x
2. Step 2: Convert to fraction form
   12,684.63/19,023.86 = 5,285.05/x
3. Step 3: Cross multiply
   12,684.63x = 19,023.86 × 5,285.05
4. Step 4: Simplify right side
   12,684.63x = 100,542,051.29
5. Step 5: Solve for x
   x = 100,542,051.29/12,684.63
6. Step 6: Final answer
   x = 7,926.29