Finding the Fourth Proportional to 28,158.29, 42,238.83 and 8,434.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,158.29 : 42,238.83 = 8,434.96 : x
2. Step 2: Convert to fraction form
   28,158.29/42,238.83 = 8,434.96/x
3. Step 3: Cross multiply
   28,158.29x = 42,238.83 × 8,434.96
4. Step 4: Simplify right side
   28,158.29x = 356,282,799.32
5. Step 5: Solve for x
   x = 356,282,799.32/28,158.29
6. Step 6: Final answer
   x = 12,652.86