Finding the Fourth Proportional to 3,887.79, 5,330.27 and 3,817.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,887.79 : 5,330.27 = 3,817.80 : x
2. Step 2: Convert to fraction form
   3,887.79/5,330.27 = 3,817.80/x
3. Step 3: Cross multiply
   3,887.79x = 5,330.27 × 3,817.80
4. Step 4: Simplify right side
   3,887.79x = 20,349,885.72
5. Step 5: Solve for x
   x = 20,349,885.72/3,887.79
6. Step 6: Final answer
   x = 5,234.31