Finding the Fourth Proportional to 28,513.82, 42,781.68 and 20,088.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,513.82 : 42,781.68 = 20,088.42 : x
2. Step 2: Convert to fraction form
   28,513.82/42,781.68 = 20,088.42/x
3. Step 3: Cross multiply
   28,513.82x = 42,781.68 × 20,088.42
4. Step 4: Simplify right side
   28,513.82x = 859,416,356.15
5. Step 5: Solve for x
   x = 859,416,356.15/28,513.82
6. Step 6: Final answer
   x = 30,140.34