Finding the Fourth Proportional to 5,142.15, 7,712.01 and 2,218.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,142.15 : 7,712.01 = 2,218.86 : x
2. Step 2: Convert to fraction form
   5,142.15/7,712.01 = 2,218.86/x
3. Step 3: Cross multiply
   5,142.15x = 7,712.01 × 2,218.86
4. Step 4: Simplify right side
   5,142.15x = 17,111,870.51
5. Step 5: Solve for x
   x = 17,111,870.51/5,142.15
6. Step 6: Final answer
   x = 3,327.77