Finding the Fourth Proportional to 91,830.40, 137,721.30 and 28,650.40

Step by Step Solution

1. Step 1: Write the proportion equation
   91,830.40 : 137,721.30 = 28,650.40 : x
2. Step 2: Convert to fraction form
   91,830.40/137,721.30 = 28,650.40/x
3. Step 3: Cross multiply
   91,830.40x = 137,721.30 × 28,650.40
4. Step 4: Simplify right side
   91,830.40x = 3,945,770,333.52
5. Step 5: Solve for x
   x = 3,945,770,333.52/91,830.40
6. Step 6: Final answer
   x = 42,968.02