Finding the Fourth Proportional to 99,984.49, 137,981.97 and 54,661.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,984.49 : 137,981.97 = 54,661.57 : x
2. Step 2: Convert to fraction form
   99,984.49/137,981.97 = 54,661.57/x
3. Step 3: Cross multiply
   99,984.49x = 137,981.97 × 54,661.57
4. Step 4: Simplify right side
   99,984.49x = 7,542,311,111.89
5. Step 5: Solve for x
   x = 7,542,311,111.89/99,984.49
6. Step 6: Final answer
   x = 75,434.81