Finding the Fourth Proportional to 1,050.84, 1,572.42 and 855.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.84 : 1,572.42 = 855.38 : x
2. Step 2: Convert to fraction form
   1,050.84/1,572.42 = 855.38/x
3. Step 3: Cross multiply
   1,050.84x = 1,572.42 × 855.38
4. Step 4: Simplify right side
   1,050.84x = 1,345,014.02
5. Step 5: Solve for x
   x = 1,345,014.02/1,050.84
6. Step 6: Final answer
   x = 1,279.94