Finding the Fourth Proportional to 2,820.86, 3,892.73 and 1,561.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.86 : 3,892.73 = 1,561.84 : x
2. Step 2: Convert to fraction form
   2,820.86/3,892.73 = 1,561.84/x
3. Step 3: Cross multiply
   2,820.86x = 3,892.73 × 1,561.84
4. Step 4: Simplify right side
   2,820.86x = 6,079,821.42
5. Step 5: Solve for x
   x = 6,079,821.42/2,820.86
6. Step 6: Final answer
   x = 2,155.31