Finding the Fourth Proportional to 1,855.39, 2,780.71 and 758.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,855.39 : 2,780.71 = 758.45 : x
2. Step 2: Convert to fraction form
   1,855.39/2,780.71 = 758.45/x
3. Step 3: Cross multiply
   1,855.39x = 2,780.71 × 758.45
4. Step 4: Simplify right side
   1,855.39x = 2,109,029.50
5. Step 5: Solve for x
   x = 2,109,029.50/1,855.39
6. Step 6: Final answer
   x = 1,136.70