Finding the Fourth Proportional to 288,807.27, 433,118.73 and 99,221.91

Step by Step Solution

1. Step 1: Write the proportion equation
   288,807.27 : 433,118.73 = 99,221.91 : x
2. Step 2: Convert to fraction form
   288,807.27/433,118.73 = 99,221.91/x
3. Step 3: Cross multiply
   288,807.27x = 433,118.73 × 99,221.91
4. Step 4: Simplify right side
   288,807.27x = 42,974,867,647.37
5. Step 5: Solve for x
   x = 42,974,867,647.37/288,807.27
6. Step 6: Final answer
   x = 148,801.20