Finding the Fourth Proportional to 13,311.74, 19,967.16 and 5,411.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.74 : 19,967.16 = 5,411.91 : x
2. Step 2: Convert to fraction form
   13,311.74/19,967.16 = 5,411.91/x
3. Step 3: Cross multiply
   13,311.74x = 19,967.16 × 5,411.91
4. Step 4: Simplify right side
   13,311.74x = 108,060,537.61
5. Step 5: Solve for x
   x = 108,060,537.61/13,311.74
6. Step 6: Final answer
   x = 8,117.69