Finding the Fourth Proportional to 3,520.10, 5,278.86 and 1,054.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,520.10 : 5,278.86 = 1,054.09 : x
2. Step 2: Convert to fraction form
   3,520.10/5,278.86 = 1,054.09/x
3. Step 3: Cross multiply
   3,520.10x = 5,278.86 × 1,054.09
4. Step 4: Simplify right side
   3,520.10x = 5,564,393.54
5. Step 5: Solve for x
   x = 5,564,393.54/3,520.10
6. Step 6: Final answer
   x = 1,580.75