Finding the Fourth Proportional to 99,790.84, 137,709.30 and 54,469.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,790.84 : 137,709.30 = 54,469.72 : x
2. Step 2: Convert to fraction form
   99,790.84/137,709.30 = 54,469.72/x
3. Step 3: Cross multiply
   99,790.84x = 137,709.30 × 54,469.72
4. Step 4: Simplify right side
   99,790.84x = 7,500,987,012.40
5. Step 5: Solve for x
   x = 7,500,987,012.40/99,790.84
6. Step 6: Final answer
   x = 75,167.09