Finding the Fourth Proportional to 1,075.31, 1,484.74 and 853.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.31 : 1,484.74 = 853.89 : x
2. Step 2: Convert to fraction form
   1,075.31/1,484.74 = 853.89/x
3. Step 3: Cross multiply
   1,075.31x = 1,484.74 × 853.89
4. Step 4: Simplify right side
   1,075.31x = 1,267,804.64
5. Step 5: Solve for x
   x = 1,267,804.64/1,075.31
6. Step 6: Final answer
   x = 1,179.01