Finding the Fourth Proportional to 28,158.96, 42,250.23 and 12,355.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,158.96 : 42,250.23 = 12,355.83 : x
2. Step 2: Convert to fraction form
   28,158.96/42,250.23 = 12,355.83/x
3. Step 3: Cross multiply
   28,158.96x = 42,250.23 × 12,355.83
4. Step 4: Simplify right side
   28,158.96x = 522,036,659.34
5. Step 5: Solve for x
   x = 522,036,659.34/28,158.96
6. Step 6: Final answer
   x = 18,538.92