Finding the Fourth Proportional to 1,445.76, 2,166.72 and 868.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.76 : 2,166.72 = 868.80 : x
2. Step 2: Convert to fraction form
   1,445.76/2,166.72 = 868.80/x
3. Step 3: Cross multiply
   1,445.76x = 2,166.72 × 868.80
4. Step 4: Simplify right side
   1,445.76x = 1,882,446.34
5. Step 5: Solve for x
   x = 1,882,446.34/1,445.76
6. Step 6: Final answer
   x = 1,302.05