Finding the Fourth Proportional to 288,981.42, 433,287.50 and 138,923.12

Step by Step Solution

1. Step 1: Write the proportion equation
   288,981.42 : 433,287.50 = 138,923.12 : x
2. Step 2: Convert to fraction form
   288,981.42/433,287.50 = 138,923.12/x
3. Step 3: Cross multiply
   288,981.42x = 433,287.50 × 138,923.12
4. Step 4: Simplify right side
   288,981.42x = 60,193,648,495.95
5. Step 5: Solve for x
   x = 60,193,648,495.95/288,981.42
6. Step 6: Final answer
   x = 208,295.91