Finding the Fourth Proportional to 1,777.76, 2,665.52 and 853.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.76 : 2,665.52 = 853.52 : x
2. Step 2: Convert to fraction form
   1,777.76/2,665.52 = 853.52/x
3. Step 3: Cross multiply
   1,777.76x = 2,665.52 × 853.52
4. Step 4: Simplify right side
   1,777.76x = 2,275,074.63
5. Step 5: Solve for x
   x = 2,275,074.63/1,777.76
6. Step 6: Final answer
   x = 1,279.74