Finding the Fourth Proportional to 1,342.55, 1,852.31 and 870.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.55 : 1,852.31 = 870.46 : x
2. Step 2: Convert to fraction form
   1,342.55/1,852.31 = 870.46/x
3. Step 3: Cross multiply
   1,342.55x = 1,852.31 × 870.46
4. Step 4: Simplify right side
   1,342.55x = 1,612,361.76
5. Step 5: Solve for x
   x = 1,612,361.76/1,342.55
6. Step 6: Final answer
   x = 1,200.97