Finding the Fourth Proportional to 2,561.88, 3,845.86 and 2,156.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.88 : 3,845.86 = 2,156.07 : x
2. Step 2: Convert to fraction form
   2,561.88/3,845.86 = 2,156.07/x
3. Step 3: Cross multiply
   2,561.88x = 3,845.86 × 2,156.07
4. Step 4: Simplify right side
   2,561.88x = 8,291,937.98
5. Step 5: Solve for x
   x = 8,291,937.98/2,561.88
6. Step 6: Final answer
   x = 3,236.66