Finding the Fourth Proportional to 2,625.82, 3,938.98 and 870.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,625.82 : 3,938.98 = 870.45 : x
2. Step 2: Convert to fraction form
   2,625.82/3,938.98 = 870.45/x
3. Step 3: Cross multiply
   2,625.82x = 3,938.98 × 870.45
4. Step 4: Simplify right side
   2,625.82x = 3,428,669.83
5. Step 5: Solve for x
   x = 3,428,669.83/2,625.82
6. Step 6: Final answer
   x = 1,305.75