Finding the Fourth Proportional to 3,418.02, 5,133.52 and 2,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.02 : 5,133.52 = 2,128.50 : x
2. Step 2: Convert to fraction form
   3,418.02/5,133.52 = 2,128.50/x
3. Step 3: Cross multiply
   3,418.02x = 5,133.52 × 2,128.50
4. Step 4: Simplify right side
   3,418.02x = 10,926,697.32
5. Step 5: Solve for x
   x = 10,926,697.32/3,418.02
6. Step 6: Final answer
   x = 3,196.79