Finding the Fourth Proportional to 20,342.52, 28,085.72 and 13,967.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,342.52 : 28,085.72 = 13,967.05 : x
2. Step 2: Convert to fraction form
   20,342.52/28,085.72 = 13,967.05/x
3. Step 3: Cross multiply
   20,342.52x = 28,085.72 × 13,967.05
4. Step 4: Simplify right side
   20,342.52x = 392,274,655.53
5. Step 5: Solve for x
   x = 392,274,655.53/20,342.52
6. Step 6: Final answer
   x = 19,283.48