Finding the Fourth Proportional to 288,256.72, 431,910.64 and 98,613.42

Step by Step Solution

1. Step 1: Write the proportion equation
   288,256.72 : 431,910.64 = 98,613.42 : x
2. Step 2: Convert to fraction form
   288,256.72/431,910.64 = 98,613.42/x
3. Step 3: Cross multiply
   288,256.72x = 431,910.64 × 98,613.42
4. Step 4: Simplify right side
   288,256.72x = 42,592,183,293.69
5. Step 5: Solve for x
   x = 42,592,183,293.69/288,256.72
6. Step 6: Final answer
   x = 147,757.82