Finding the Fourth Proportional to 3,864.51, 5,355.47 and 3,790.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,864.51 : 5,355.47 = 3,790.67 : x
2. Step 2: Convert to fraction form
   3,864.51/5,355.47 = 3,790.67/x
3. Step 3: Cross multiply
   3,864.51x = 5,355.47 × 3,790.67
4. Step 4: Simplify right side
   3,864.51x = 20,300,773.73
5. Step 5: Solve for x
   x = 20,300,773.73/3,864.51
6. Step 6: Final answer
   x = 5,253.13