Finding the Fourth Proportional to 12,690.19, 19,039.18 and 5,676.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690.19 : 19,039.18 = 5,676.10 : x
2. Step 2: Convert to fraction form
   12,690.19/19,039.18 = 5,676.10/x
3. Step 3: Cross multiply
   12,690.19x = 19,039.18 × 5,676.10
4. Step 4: Simplify right side
   12,690.19x = 108,068,289.60
5. Step 5: Solve for x
   x = 108,068,289.60/12,690.19
6. Step 6: Final answer
   x = 8,515.89