Finding the Fourth Proportional to 107,398.72, 161,085.61 and 28,519.12

Step by Step Solution

1. Step 1: Write the proportion equation
   107,398.72 : 161,085.61 = 28,519.12 : x
2. Step 2: Convert to fraction form
   107,398.72/161,085.61 = 28,519.12/x
3. Step 3: Cross multiply
   107,398.72x = 161,085.61 × 28,519.12
4. Step 4: Simplify right side
   107,398.72x = 4,594,019,841.86
5. Step 5: Solve for x
   x = 4,594,019,841.86/107,398.72
6. Step 6: Final answer
   x = 42,775.37