Finding the Fourth Proportional to 3,415.72, 5,116.86 and 2,550.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,415.72 : 5,116.86 = 2,550.76 : x
2. Step 2: Convert to fraction form
   3,415.72/5,116.86 = 2,550.76/x
3. Step 3: Cross multiply
   3,415.72x = 5,116.86 × 2,550.76
4. Step 4: Simplify right side
   3,415.72x = 13,051,881.81
5. Step 5: Solve for x
   x = 13,051,881.81/3,415.72
6. Step 6: Final answer
   x = 3,821.12