Finding the Fourth Proportional to 882.61, 1,323.99 and 870.61

Step by Step Solution

1. Step 1: Write the proportion equation
   882.61 : 1,323.99 = 870.61 : x
2. Step 2: Convert to fraction form
   882.61/1,323.99 = 870.61/x
3. Step 3: Cross multiply
   882.61x = 1,323.99 × 870.61
4. Step 4: Simplify right side
   882.61x = 1,152,667.96
5. Step 5: Solve for x
   x = 1,152,667.96/882.61
6. Step 6: Final answer
   x = 1,305.98