Finding the Fourth Proportional to 28,255.72, 42,355.98 and 13,460.68

Step by Step Solution

1. Step 1: Write the proportion equation
   28,255.72 : 42,355.98 = 13,460.68 : x
2. Step 2: Convert to fraction form
   28,255.72/42,355.98 = 13,460.68/x
3. Step 3: Cross multiply
   28,255.72x = 42,355.98 × 13,460.68
4. Step 4: Simplify right side
   28,255.72x = 570,140,292.87
5. Step 5: Solve for x
   x = 570,140,292.87/28,255.72
6. Step 6: Final answer
   x = 20,177.87