Finding the Fourth Proportional to 1,002.84, 1,376.55 and 889.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.84 : 1,376.55 = 889.85 : x
2. Step 2: Convert to fraction form
   1,002.84/1,376.55 = 889.85/x
3. Step 3: Cross multiply
   1,002.84x = 1,376.55 × 889.85
4. Step 4: Simplify right side
   1,002.84x = 1,224,923.02
5. Step 5: Solve for x
   x = 1,224,923.02/1,002.84
6. Step 6: Final answer
   x = 1,221.45