Finding the Fourth Proportional to 2,558.86, 3,840.72 and 2,106.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.86 : 3,840.72 = 2,106.88 : x
2. Step 2: Convert to fraction form
   2,558.86/3,840.72 = 2,106.88/x
3. Step 3: Cross multiply
   2,558.86x = 3,840.72 × 2,106.88
4. Step 4: Simplify right side
   2,558.86x = 8,091,936.15
5. Step 5: Solve for x
   x = 8,091,936.15/2,558.86
6. Step 6: Final answer
   x = 3,162.32