Finding the Fourth Proportional to 13,424.84, 20,145.18 and 5,111.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,424.84 : 20,145.18 = 5,111.86 : x
2. Step 2: Convert to fraction form
   13,424.84/20,145.18 = 5,111.86/x
3. Step 3: Cross multiply
   13,424.84x = 20,145.18 × 5,111.86
4. Step 4: Simplify right side
   13,424.84x = 102,979,339.83
5. Step 5: Solve for x
   x = 102,979,339.83/13,424.84
6. Step 6: Final answer
   x = 7,670.81