Finding the Fourth Proportional to 12,987.10, 19,483.66 and 4,103.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.10 : 19,483.66 = 4,103.31 : x
2. Step 2: Convert to fraction form
   12,987.10/19,483.66 = 4,103.31/x
3. Step 3: Cross multiply
   12,987.10x = 19,483.66 × 4,103.31
4. Step 4: Simplify right side
   12,987.10x = 79,947,496.91
5. Step 5: Solve for x
   x = 79,947,496.91/12,987.10
6. Step 6: Final answer
   x = 6,155.92