Finding the Fourth Proportional to 11,658.36, 17,491.86 and 5,421.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,658.36 : 17,491.86 = 5,421.72 : x
2. Step 2: Convert to fraction form
   11,658.36/17,491.86 = 5,421.72/x
3. Step 3: Cross multiply
   11,658.36x = 17,491.86 × 5,421.72
4. Step 4: Simplify right side
   11,658.36x = 94,835,967.20
5. Step 5: Solve for x
   x = 94,835,967.20/11,658.36
6. Step 6: Final answer
   x = 8,134.59