Finding the Fourth Proportional to 2,820.33, 3,892.08 and 1,561.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.33 : 3,892.08 = 1,561.50 : x
2. Step 2: Convert to fraction form
   2,820.33/3,892.08 = 1,561.50/x
3. Step 3: Cross multiply
   2,820.33x = 3,892.08 × 1,561.50
4. Step 4: Simplify right side
   2,820.33x = 6,077,474.18
5. Step 5: Solve for x
   x = 6,077,474.18/2,820.33
6. Step 6: Final answer
   x = 2,154.88