Finding the Fourth Proportional to 100,801.78, 139,103.89 and 54,859.46

Step by Step Solution

1. Step 1: Write the proportion equation
   100,801.78 : 139,103.89 = 54,859.46 : x
2. Step 2: Convert to fraction form
   100,801.78/139,103.89 = 54,859.46/x
3. Step 3: Cross multiply
   100,801.78x = 139,103.89 × 54,859.46
4. Step 4: Simplify right side
   100,801.78x = 7,631,164,289.30
5. Step 5: Solve for x
   x = 7,631,164,289.30/100,801.78
6. Step 6: Final answer
   x = 75,704.66