Finding the Fourth Proportional to 28,345.78, 42,453.87 and 13,565.08

Step by Step Solution

1. Step 1: Write the proportion equation
   28,345.78 : 42,453.87 = 13,565.08 : x
2. Step 2: Convert to fraction form
   28,345.78/42,453.87 = 13,565.08/x
3. Step 3: Cross multiply
   28,345.78x = 42,453.87 × 13,565.08
4. Step 4: Simplify right side
   28,345.78x = 575,890,142.86
5. Step 5: Solve for x
   x = 575,890,142.86/28,345.78
6. Step 6: Final answer
   x = 20,316.61