Finding the Fourth Proportional to 100,738.53, 139,021.52 and 55,419.03

Step by Step Solution

1. Step 1: Write the proportion equation
   100,738.53 : 139,021.52 = 55,419.03 : x
2. Step 2: Convert to fraction form
   100,738.53/139,021.52 = 55,419.03/x
3. Step 3: Cross multiply
   100,738.53x = 139,021.52 × 55,419.03
4. Step 4: Simplify right side
   100,738.53x = 7,704,437,510.43
5. Step 5: Solve for x
   x = 7,704,437,510.43/100,738.53
6. Step 6: Final answer
   x = 76,479.55