Finding the Fourth Proportional to 1,367.80, 1,886.34 and 993.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.80 : 1,886.34 = 993.40 : x
2. Step 2: Convert to fraction form
   1,367.80/1,886.34 = 993.40/x
3. Step 3: Cross multiply
   1,367.80x = 1,886.34 × 993.40
4. Step 4: Simplify right side
   1,367.80x = 1,873,890.16
5. Step 5: Solve for x
   x = 1,873,890.16/1,367.80
6. Step 6: Final answer
   x = 1,370.00