Finding the Fourth Proportional to 1,369.31, 2,056.69 and 850.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.31 : 2,056.69 = 850.20 : x
2. Step 2: Convert to fraction form
   1,369.31/2,056.69 = 850.20/x
3. Step 3: Cross multiply
   1,369.31x = 2,056.69 × 850.20
4. Step 4: Simplify right side
   1,369.31x = 1,748,591.19
5. Step 5: Solve for x
   x = 1,748,591.19/1,369.31
6. Step 6: Final answer
   x = 1,276.99