Finding the Fourth Proportional to 1,569.45, 2,165.82 and 870.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.45 : 2,165.82 = 870.82 : x
2. Step 2: Convert to fraction form
   1,569.45/2,165.82 = 870.82/x
3. Step 3: Cross multiply
   1,569.45x = 2,165.82 × 870.82
4. Step 4: Simplify right side
   1,569.45x = 1,886,045.35
5. Step 5: Solve for x
   x = 1,886,045.35/1,569.45
6. Step 6: Final answer
   x = 1,201.73