Finding the Fourth Proportional to 3,978.82, 5,491.29 and 2,407.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.82 : 5,491.29 = 2,407.06 : x
2. Step 2: Convert to fraction form
   3,978.82/5,491.29 = 2,407.06/x
3. Step 3: Cross multiply
   3,978.82x = 5,491.29 × 2,407.06
4. Step 4: Simplify right side
   3,978.82x = 13,217,864.51
5. Step 5: Solve for x
   x = 13,217,864.51/3,978.82
6. Step 6: Final answer
   x = 3,322.06