Finding the Fourth Proportional to 28,296.72, 42,380.37 and 13,516.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28,296.72 : 42,380.37 = 13,516.02 : x
2. Step 2: Convert to fraction form
   28,296.72/42,380.37 = 13,516.02/x
3. Step 3: Cross multiply
   28,296.72x = 42,380.37 × 13,516.02
4. Step 4: Simplify right side
   28,296.72x = 572,813,928.53
5. Step 5: Solve for x
   x = 572,813,928.53/28,296.72
6. Step 6: Final answer
   x = 20,243.12