Finding the Fourth Proportional to 19,280.96, 28,928.52 and 13,777.62

Step by Step Solution

1. Step 1: Write the proportion equation
   19,280.96 : 28,928.52 = 13,777.62 : x
2. Step 2: Convert to fraction form
   19,280.96/28,928.52 = 13,777.62/x
3. Step 3: Cross multiply
   19,280.96x = 28,928.52 × 13,777.62
4. Step 4: Simplify right side
   19,280.96x = 398,566,155.72
5. Step 5: Solve for x
   x = 398,566,155.72/19,280.96
6. Step 6: Final answer
   x = 20,671.49