Finding the Fourth Proportional to 14,105.68, 21,034.34 and 13,120.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,105.68 : 21,034.34 = 13,120.72 : x
2. Step 2: Convert to fraction form
   14,105.68/21,034.34 = 13,120.72/x
3. Step 3: Cross multiply
   14,105.68x = 21,034.34 × 13,120.72
4. Step 4: Simplify right side
   14,105.68x = 275,985,685.52
5. Step 5: Solve for x
   x = 275,985,685.52/14,105.68
6. Step 6: Final answer
   x = 19,565.57