Finding the Fourth Proportional to 1,336.50, 2,000.50 and 870.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.50 : 2,000.50 = 870.55 : x
2. Step 2: Convert to fraction form
   1,336.50/2,000.50 = 870.55/x
3. Step 3: Cross multiply
   1,336.50x = 2,000.50 × 870.55
4. Step 4: Simplify right side
   1,336.50x = 1,741,528.10
5. Step 5: Solve for x
   x = 1,741,528.10/1,336.50
6. Step 6: Final answer
   x = 1,303.05