Finding the Fourth Proportional to 90,648.86, 135,972.27 and 55,119.96

Step by Step Solution

1. Step 1: Write the proportion equation
   90,648.86 : 135,972.27 = 55,119.96 : x
2. Step 2: Convert to fraction form
   90,648.86/135,972.27 = 55,119.96/x
3. Step 3: Cross multiply
   90,648.86x = 135,972.27 × 55,119.96
4. Step 4: Simplify right side
   90,648.86x = 7,494,786,083.51
5. Step 5: Solve for x
   x = 7,494,786,083.51/90,648.86
6. Step 6: Final answer
   x = 82,679.32