Finding the Fourth Proportional to 1,343.78, 1,852.67 and 870.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.78 : 1,852.67 = 870.83 : x
2. Step 2: Convert to fraction form
   1,343.78/1,852.67 = 870.83/x
3. Step 3: Cross multiply
   1,343.78x = 1,852.67 × 870.83
4. Step 4: Simplify right side
   1,343.78x = 1,613,360.89
5. Step 5: Solve for x
   x = 1,613,360.89/1,343.78
6. Step 6: Final answer
   x = 1,200.62