Finding the Fourth Proportional to 2,551.51, 3,521.11 and 1,667.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.51 : 3,521.11 = 1,667.31 : x
2. Step 2: Convert to fraction form
   2,551.51/3,521.11 = 1,667.31/x
3. Step 3: Cross multiply
   2,551.51x = 3,521.11 × 1,667.31
4. Step 4: Simplify right side
   2,551.51x = 5,870,781.91
5. Step 5: Solve for x
   x = 5,870,781.91/2,551.51
6. Step 6: Final answer
   x = 2,300.90