Finding the Fourth Proportional to 55,128.89, 76,077.68 and 29,978.39

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.89 : 76,077.68 = 29,978.39 : x
2. Step 2: Convert to fraction form
   55,128.89/76,077.68 = 29,978.39/x
3. Step 3: Cross multiply
   55,128.89x = 76,077.68 × 29,978.39
4. Step 4: Simplify right side
   55,128.89x = 2,280,685,831.05
5. Step 5: Solve for x
   x = 2,280,685,831.05/55,128.89
6. Step 6: Final answer
   x = 41,370.07