Finding the Fourth Proportional to 2,625.57, 3,938.09 and 870.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,625.57 : 3,938.09 = 870.51 : x
2. Step 2: Convert to fraction form
   2,625.57/3,938.09 = 870.51/x
3. Step 3: Cross multiply
   2,625.57x = 3,938.09 × 870.51
4. Step 4: Simplify right side
   2,625.57x = 3,428,142.37
5. Step 5: Solve for x
   x = 3,428,142.37/2,625.57
6. Step 6: Final answer
   x = 1,305.68