Finding the Fourth Proportional to 3,715.91, 5,128.02 and 2,223.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,715.91 : 5,128.02 = 2,223.89 : x
2. Step 2: Convert to fraction form
   3,715.91/5,128.02 = 2,223.89/x
3. Step 3: Cross multiply
   3,715.91x = 5,128.02 × 2,223.89
4. Step 4: Simplify right side
   3,715.91x = 11,404,141.28
5. Step 5: Solve for x
   x = 11,404,141.28/3,715.91
6. Step 6: Final answer
   x = 3,069.00