Finding the Fourth Proportional to 100,401.48, 138,555.89 and 55,081.78

Step by Step Solution

1. Step 1: Write the proportion equation
   100,401.48 : 138,555.89 = 55,081.78 : x
2. Step 2: Convert to fraction form
   100,401.48/138,555.89 = 55,081.78/x
3. Step 3: Cross multiply
   100,401.48x = 138,555.89 × 55,081.78
4. Step 4: Simplify right side
   100,401.48x = 7,631,905,050.68
5. Step 5: Solve for x
   x = 7,631,905,050.68/100,401.48
6. Step 6: Final answer
   x = 76,013.87