Finding the Fourth Proportional to 100,791.81, 139,092.72 and 55,469.78

Step by Step Solution

1. Step 1: Write the proportion equation
   100,791.81 : 139,092.72 = 55,469.78 : x
2. Step 2: Convert to fraction form
   100,791.81/139,092.72 = 55,469.78/x
3. Step 3: Cross multiply
   100,791.81x = 139,092.72 × 55,469.78
4. Step 4: Simplify right side
   100,791.81x = 7,715,442,578.00
5. Step 5: Solve for x
   x = 7,715,442,578.00/100,791.81
6. Step 6: Final answer
   x = 76,548.31