Finding the Fourth Proportional to 13,011.42, 19,523.18 and 4,128.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,011.42 : 19,523.18 = 4,128.15 : x
2. Step 2: Convert to fraction form
   13,011.42/19,523.18 = 4,128.15/x
3. Step 3: Cross multiply
   13,011.42x = 19,523.18 × 4,128.15
4. Step 4: Simplify right side
   13,011.42x = 80,594,615.52
5. Step 5: Solve for x
   x = 80,594,615.52/13,011.42
6. Step 6: Final answer
   x = 6,194.14