Finding the Fourth Proportional to 1,401.38, 1,933.91 and 780.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.38 : 1,933.91 = 780.38 : x
2. Step 2: Convert to fraction form
   1,401.38/1,933.91 = 780.38/x
3. Step 3: Cross multiply
   1,401.38x = 1,933.91 × 780.38
4. Step 4: Simplify right side
   1,401.38x = 1,509,184.69
5. Step 5: Solve for x
   x = 1,509,184.69/1,401.38
6. Step 6: Final answer
   x = 1,076.93