Finding the Fourth Proportional to 28,434.15, 42,662.22 and 11,789.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,434.15 : 42,662.22 = 11,789.91 : x
2. Step 2: Convert to fraction form
   28,434.15/42,662.22 = 11,789.91/x
3. Step 3: Cross multiply
   28,434.15x = 42,662.22 × 11,789.91
4. Step 4: Simplify right side
   28,434.15x = 502,983,734.20
5. Step 5: Solve for x
   x = 502,983,734.20/28,434.15
6. Step 6: Final answer
   x = 17,689.42