Finding the Fourth Proportional to 100,738.89, 139,019.97 and 55,421.52

Step by Step Solution

1. Step 1: Write the proportion equation
   100,738.89 : 139,019.97 = 55,421.52 : x
2. Step 2: Convert to fraction form
   100,738.89/139,019.97 = 55,421.52/x
3. Step 3: Cross multiply
   100,738.89x = 139,019.97 × 55,421.52
4. Step 4: Simplify right side
   100,738.89x = 7,704,698,047.75
5. Step 5: Solve for x
   x = 7,704,698,047.75/100,738.89
6. Step 6: Final answer
   x = 76,481.86