Finding the Fourth Proportional to 11,687.83, 17,531.15 and 4,291.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,687.83 : 17,531.15 = 4,291.72 : x
2. Step 2: Convert to fraction form
   11,687.83/17,531.15 = 4,291.72/x
3. Step 3: Cross multiply
   11,687.83x = 17,531.15 × 4,291.72
4. Step 4: Simplify right side
   11,687.83x = 75,238,721.79
5. Step 5: Solve for x
   x = 75,238,721.79/11,687.83
6. Step 6: Final answer
   x = 6,437.36