Finding the Fourth Proportional to 3,422.55, 5,128.62 and 2,102.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,422.55 : 5,128.62 = 2,102.86 : x
2. Step 2: Convert to fraction form
   3,422.55/5,128.62 = 2,102.86/x
3. Step 3: Cross multiply
   3,422.55x = 5,128.62 × 2,102.86
4. Step 4: Simplify right side
   3,422.55x = 10,784,768.38
5. Step 5: Solve for x
   x = 10,784,768.38/3,422.55
6. Step 6: Final answer
   x = 3,151.09