Finding the Fourth Proportional to 5,128.66, 7,078.20 and 3,554.02

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.66 : 7,078.20 = 3,554.02 : x
2. Step 2: Convert to fraction form
   5,128.66/7,078.20 = 3,554.02/x
3. Step 3: Cross multiply
   5,128.66x = 7,078.20 × 3,554.02
4. Step 4: Simplify right side
   5,128.66x = 25,156,064.36
5. Step 5: Solve for x
   x = 25,156,064.36/5,128.66
6. Step 6: Final answer
   x = 4,905.00