Finding the Fourth Proportional to 91,338.85, 137,021.94 and 28,153.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,338.85 : 137,021.94 = 28,153.72 : x
2. Step 2: Convert to fraction form
   91,338.85/137,021.94 = 28,153.72/x
3. Step 3: Cross multiply
   91,338.85x = 137,021.94 × 28,153.72
4. Step 4: Simplify right side
   91,338.85x = 3,857,676,990.06
5. Step 5: Solve for x
   x = 3,857,676,990.06/91,338.85
6. Step 6: Final answer
   x = 42,234.79