Finding the Fourth Proportional to 55,128.78, 76,077.71 and 31,255.45

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.78 : 76,077.71 = 31,255.45 : x
2. Step 2: Convert to fraction form
   55,128.78/76,077.71 = 31,255.45/x
3. Step 3: Cross multiply
   55,128.78x = 76,077.71 × 31,255.45
4. Step 4: Simplify right side
   55,128.78x = 2,377,843,061.02
5. Step 5: Solve for x
   x = 2,377,843,061.02/55,128.78
6. Step 6: Final answer
   x = 43,132.52