Finding the Fourth Proportional to 11,631.81, 17,437.31 and 4,231.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,631.81 : 17,437.31 = 4,231.05 : x
2. Step 2: Convert to fraction form
   11,631.81/17,437.31 = 4,231.05/x
3. Step 3: Cross multiply
   11,631.81x = 17,437.31 × 4,231.05
4. Step 4: Simplify right side
   11,631.81x = 73,778,109.32
5. Step 5: Solve for x
   x = 73,778,109.32/11,631.81
6. Step 6: Final answer
   x = 6,342.79