Finding the Fourth Proportional to 288,949.10, 433,315.86 and 99,355.83

Step by Step Solution

1. Step 1: Write the proportion equation
   288,949.10 : 433,315.86 = 99,355.83 : x
2. Step 2: Convert to fraction form
   288,949.10/433,315.86 = 99,355.83/x
3. Step 3: Cross multiply
   288,949.10x = 433,315.86 × 99,355.83
4. Step 4: Simplify right side
   288,949.10x = 43,052,456,922.46
5. Step 5: Solve for x
   x = 43,052,456,922.46/288,949.10
6. Step 6: Final answer
   x = 148,996.68