Finding the Fourth Proportional to 1,367.89, 1,886.90 and 778.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.89 : 1,886.90 = 778.01 : x
2. Step 2: Convert to fraction form
   1,367.89/1,886.90 = 778.01/x
3. Step 3: Cross multiply
   1,367.89x = 1,886.90 × 778.01
4. Step 4: Simplify right side
   1,367.89x = 1,468,013.74
5. Step 5: Solve for x
   x = 1,468,013.74/1,367.89
6. Step 6: Final answer
   x = 1,073.20