Finding the Fourth Proportional to 11,919.31, 17,875.48 and 4,518.43

Step by Step Solution

1. Step 1: Write the proportion equation
   11,919.31 : 17,875.48 = 4,518.43 : x
2. Step 2: Convert to fraction form
   11,919.31/17,875.48 = 4,518.43/x
3. Step 3: Cross multiply
   11,919.31x = 17,875.48 × 4,518.43
4. Step 4: Simplify right side
   11,919.31x = 80,769,105.10
5. Step 5: Solve for x
   x = 80,769,105.10/11,919.31
6. Step 6: Final answer
   x = 6,776.32