Finding the Fourth Proportional to 1,342.35, 1,851.82 and 870.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.35 : 1,851.82 = 870.40 : x
2. Step 2: Convert to fraction form
   1,342.35/1,851.82 = 870.40/x
3. Step 3: Cross multiply
   1,342.35x = 1,851.82 × 870.40
4. Step 4: Simplify right side
   1,342.35x = 1,611,824.13
5. Step 5: Solve for x
   x = 1,611,824.13/1,342.35
6. Step 6: Final answer
   x = 1,200.75