Finding the Fourth Proportional to 55,128.88, 76,077.48 and 29,978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.88 : 76,077.48 = 29,978.38 : x
2. Step 2: Convert to fraction form
   55,128.88/76,077.48 = 29,978.38/x
3. Step 3: Cross multiply
   55,128.88x = 76,077.48 × 29,978.38
4. Step 4: Simplify right side
   55,128.88x = 2,280,679,604.88
5. Step 5: Solve for x
   x = 2,280,679,604.88/55,128.88
6. Step 6: Final answer
   x = 41,369.96