Finding the Fourth Proportional to 1,367.18, 1,887.33 and 870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.18 : 1,887.33 = 870.50 : x
2. Step 2: Convert to fraction form
   1,367.18/1,887.33 = 870.50/x
3. Step 3: Cross multiply
   1,367.18x = 1,887.33 × 870.50
4. Step 4: Simplify right side
   1,367.18x = 1,642,911.33
5. Step 5: Solve for x
   x = 1,642,911.33/1,367.18
6. Step 6: Final answer
   x = 1,201.68