Finding the Fourth Proportional to 14,111.20, 21,145.20 and 13,333.60

Step by Step Solution

1. Step 1: Write the proportion equation
   14,111.20 : 21,145.20 = 13,333.60 : x
2. Step 2: Convert to fraction form
   14,111.20/21,145.20 = 13,333.60/x
3. Step 3: Cross multiply
   14,111.20x = 21,145.20 × 13,333.60
4. Step 4: Simplify right side
   14,111.20x = 281,941,638.72
5. Step 5: Solve for x
   x = 281,941,638.72/14,111.20
6. Step 6: Final answer
   x = 19,979.99