Finding the Fourth Proportional to 1,367.59, 1,886.70 and 870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.59 : 1,886.70 = 870.48 : x
2. Step 2: Convert to fraction form
   1,367.59/1,886.70 = 870.48/x
3. Step 3: Cross multiply
   1,367.59x = 1,886.70 × 870.48
4. Step 4: Simplify right side
   1,367.59x = 1,642,334.62
5. Step 5: Solve for x
   x = 1,642,334.62/1,367.59
6. Step 6: Final answer
   x = 1,200.90