Finding the Fourth Proportional to 2,739.89, 3,781.72 and 1,561.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,739.89 : 3,781.72 = 1,561.65 : x
2. Step 2: Convert to fraction form
   2,739.89/3,781.72 = 1,561.65/x
3. Step 3: Cross multiply
   2,739.89x = 3,781.72 × 1,561.65
4. Step 4: Simplify right side
   2,739.89x = 5,905,710.81
5. Step 5: Solve for x
   x = 5,905,710.81/2,739.89
6. Step 6: Final answer
   x = 2,155.45