Finding the Fourth Proportional to 10,091.82, 15,128.85 and 3,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,091.82 : 15,128.85 = 3,931.50 : x
2. Step 2: Convert to fraction form
   10,091.82/15,128.85 = 3,931.50/x
3. Step 3: Cross multiply
   10,091.82x = 15,128.85 × 3,931.50
4. Step 4: Simplify right side
   10,091.82x = 59,479,073.78
5. Step 5: Solve for x
   x = 59,479,073.78/10,091.82
6. Step 6: Final answer
   x = 5,893.79