Finding the Fourth Proportional to 3,626.72, 5,429.30 and 1,978.26

Step by Step Solution

1. Step 1: Write the proportion equation
   3,626.72 : 5,429.30 = 1,978.26 : x
2. Step 2: Convert to fraction form
   3,626.72/5,429.30 = 1,978.26/x
3. Step 3: Cross multiply
   3,626.72x = 5,429.30 × 1,978.26
4. Step 4: Simplify right side
   3,626.72x = 10,740,557.13
5. Step 5: Solve for x
   x = 10,740,557.13/3,626.72
6. Step 6: Final answer
   x = 2,961.51