Finding the Fourth Proportional to 100,986.83, 139,355.47 and 55,662.31

Step by Step Solution

1. Step 1: Write the proportion equation
   100,986.83 : 139,355.47 = 55,662.31 : x
2. Step 2: Convert to fraction form
   100,986.83/139,355.47 = 55,662.31/x
3. Step 3: Cross multiply
   100,986.83x = 139,355.47 × 55,662.31
4. Step 4: Simplify right side
   100,986.83x = 7,756,847,615.11
5. Step 5: Solve for x
   x = 7,756,847,615.11/100,986.83
6. Step 6: Final answer
   x = 76,810.49