Finding the Fourth Proportional to 1,176.86, 1,761.83 and 870.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,176.86 : 1,761.83 = 870.09 : x
2. Step 2: Convert to fraction form
   1,176.86/1,761.83 = 870.09/x
3. Step 3: Cross multiply
   1,176.86x = 1,761.83 × 870.09
4. Step 4: Simplify right side
   1,176.86x = 1,532,957.77
5. Step 5: Solve for x
   x = 1,532,957.77/1,176.86
6. Step 6: Final answer
   x = 1,302.58