Finding the Fourth Proportional to 28,146.12, 42,156.69 and 20,224.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,146.12 : 42,156.69 = 20,224.86 : x
2. Step 2: Convert to fraction form
   28,146.12/42,156.69 = 20,224.86/x
3. Step 3: Cross multiply
   28,146.12x = 42,156.69 × 20,224.86
4. Step 4: Simplify right side
   28,146.12x = 852,613,153.31
5. Step 5: Solve for x
   x = 852,613,153.31/28,146.12
6. Step 6: Final answer
   x = 30,292.39