Finding the Fourth Proportional to 3,521.78, 5,281.63 and 1,055.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,521.78 : 5,281.63 = 1,055.94 : x
2. Step 2: Convert to fraction form
   3,521.78/5,281.63 = 1,055.94/x
3. Step 3: Cross multiply
   3,521.78x = 5,281.63 × 1,055.94
4. Step 4: Simplify right side
   3,521.78x = 5,577,064.91
5. Step 5: Solve for x
   x = 5,577,064.91/3,521.78
6. Step 6: Final answer
   x = 1,583.59