Finding the Fourth Proportional to 100,814.42, 139,122.78 and 55,491.42

Step by Step Solution

1. Step 1: Write the proportion equation
   100,814.42 : 139,122.78 = 55,491.42 : x
2. Step 2: Convert to fraction form
   100,814.42/139,122.78 = 55,491.42/x
3. Step 3: Cross multiply
   100,814.42x = 139,122.78 × 55,491.42
4. Step 4: Simplify right side
   100,814.42x = 7,720,120,616.55
5. Step 5: Solve for x
   x = 7,720,120,616.55/100,814.42
6. Step 6: Final answer
   x = 76,577.55