Finding the Fourth Proportional to 1,370.30, 1,891.01 and 780.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.30 : 1,891.01 = 780.82 : x
2. Step 2: Convert to fraction form
   1,370.30/1,891.01 = 780.82/x
3. Step 3: Cross multiply
   1,370.30x = 1,891.01 × 780.82
4. Step 4: Simplify right side
   1,370.30x = 1,476,535.65
5. Step 5: Solve for x
   x = 1,476,535.65/1,370.30
6. Step 6: Final answer
   x = 1,077.53