Finding the Fourth Proportional to 2,820.53, 3,892.03 and 1,561.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.53 : 3,892.03 = 1,561.39 : x
2. Step 2: Convert to fraction form
   2,820.53/3,892.03 = 1,561.39/x
3. Step 3: Cross multiply
   2,820.53x = 3,892.03 × 1,561.39
4. Step 4: Simplify right side
   2,820.53x = 6,076,976.72
5. Step 5: Solve for x
   x = 6,076,976.72/2,820.53
6. Step 6: Final answer
   x = 2,154.55