Finding the Fourth Proportional to 28,659.96, 42,942.42 and 20,298.60

Step by Step Solution

1. Step 1: Write the proportion equation
   28,659.96 : 42,942.42 = 20,298.60 : x
2. Step 2: Convert to fraction form
   28,659.96/42,942.42 = 20,298.60/x
3. Step 3: Cross multiply
   28,659.96x = 42,942.42 × 20,298.60
4. Step 4: Simplify right side
   28,659.96x = 871,671,006.61
5. Step 5: Solve for x
   x = 871,671,006.61/28,659.96
6. Step 6: Final answer
   x = 30,414.24