Finding the Fourth Proportional to 100,811.41, 139,118.65 and 55,488.42

Step by Step Solution

1. Step 1: Write the proportion equation
   100,811.41 : 139,118.65 = 55,488.42 : x
2. Step 2: Convert to fraction form
   100,811.41/139,118.65 = 55,488.42/x
3. Step 3: Cross multiply
   100,811.41x = 139,118.65 × 55,488.42
4. Step 4: Simplify right side
   100,811.41x = 7,719,473,942.31
5. Step 5: Solve for x
   x = 7,719,473,942.31/100,811.41
6. Step 6: Final answer
   x = 76,573.42