Finding the Fourth Proportional to 99,945.72, 137,920.80 and 54,622.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99,945.72 : 137,920.80 = 54,622.98 : x
2. Step 2: Convert to fraction form
   99,945.72/137,920.80 = 54,622.98/x
3. Step 3: Cross multiply
   99,945.72x = 137,920.80 × 54,622.98
4. Step 4: Simplify right side
   99,945.72x = 7,533,645,099.98
5. Step 5: Solve for x
   x = 7,533,645,099.98/99,945.72
6. Step 6: Final answer
   x = 75,377.37