Finding the Fourth Proportional to 69,940.86, 104,912.01 and 55,989.57

Step by Step Solution

1. Step 1: Write the proportion equation
   69,940.86 : 104,912.01 = 55,989.57 : x
2. Step 2: Convert to fraction form
   69,940.86/104,912.01 = 55,989.57/x
3. Step 3: Cross multiply
   69,940.86x = 104,912.01 × 55,989.57
4. Step 4: Simplify right side
   69,940.86x = 5,873,978,327.74
5. Step 5: Solve for x
   x = 5,873,978,327.74/69,940.86
6. Step 6: Final answer
   x = 83,984.93