Finding the Fourth Proportional to 1,335.34, 1,843.68 and 870.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.34 : 1,843.68 = 870.40 : x
2. Step 2: Convert to fraction form
   1,335.34/1,843.68 = 870.40/x
3. Step 3: Cross multiply
   1,335.34x = 1,843.68 × 870.40
4. Step 4: Simplify right side
   1,335.34x = 1,604,739.07
5. Step 5: Solve for x
   x = 1,604,739.07/1,335.34
6. Step 6: Final answer
   x = 1,201.75