Finding the Fourth Proportional to 288.43, 432.72 and 105.98

Step by Step Solution

1. Step 1: Write the proportion equation
   288.43 : 432.72 = 105.98 : x
2. Step 2: Convert to fraction form
   288.43/432.72 = 105.98/x
3. Step 3: Cross multiply
   288.43x = 432.72 × 105.98
4. Step 4: Simplify right side
   288.43x = 45,859.67
5. Step 5: Solve for x
   x = 45,859.67/288.43
6. Step 6: Final answer
   x = 159.00