Finding the Fourth Proportional to 2,507.56, 3,451.78 and 2,171.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.56 : 3,451.78 = 2,171.32 : x
2. Step 2: Convert to fraction form
   2,507.56/3,451.78 = 2,171.32/x
3. Step 3: Cross multiply
   2,507.56x = 3,451.78 × 2,171.32
4. Step 4: Simplify right side
   2,507.56x = 7,494,918.95
5. Step 5: Solve for x
   x = 7,494,918.95/2,507.56
6. Step 6: Final answer
   x = 2,988.93