Finding the Fourth Proportional to 2,503.86, 3,455.43 and 1,560.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,503.86 : 3,455.43 = 1,560.21 : x
2. Step 2: Convert to fraction form
   2,503.86/3,455.43 = 1,560.21/x
3. Step 3: Cross multiply
   2,503.86x = 3,455.43 × 1,560.21
4. Step 4: Simplify right side
   2,503.86x = 5,391,196.44
5. Step 5: Solve for x
   x = 5,391,196.44/2,503.86
6. Step 6: Final answer
   x = 2,153.15