Finding the Fourth Proportional to 72,631.46, 108,990.94 and 28,279.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,631.46 : 108,990.94 = 28,279.10 : x
2. Step 2: Convert to fraction form
   72,631.46/108,990.94 = 28,279.10/x
3. Step 3: Cross multiply
   72,631.46x = 108,990.94 × 28,279.10
4. Step 4: Simplify right side
   72,631.46x = 3,082,165,691.35
5. Step 5: Solve for x
   x = 3,082,165,691.35/72,631.46
6. Step 6: Final answer
   x = 42,435.68