Finding the Fourth Proportional to 1,342.26, 1,851.69 and 870.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.26 : 1,851.69 = 870.31 : x
2. Step 2: Convert to fraction form
   1,342.26/1,851.69 = 870.31/x
3. Step 3: Cross multiply
   1,342.26x = 1,851.69 × 870.31
4. Step 4: Simplify right side
   1,342.26x = 1,611,544.32
5. Step 5: Solve for x
   x = 1,611,544.32/1,342.26
6. Step 6: Final answer
   x = 1,200.62