Finding the Fourth Proportional to 2,520.21, 3,780.47 and 1,059.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.21 : 3,780.47 = 1,059.48 : x
2. Step 2: Convert to fraction form
   2,520.21/3,780.47 = 1,059.48/x
3. Step 3: Cross multiply
   2,520.21x = 3,780.47 × 1,059.48
4. Step 4: Simplify right side
   2,520.21x = 4,005,335.00
5. Step 5: Solve for x
   x = 4,005,335.00/2,520.21
6. Step 6: Final answer
   x = 1,589.28