Finding the Fourth Proportional to 2,978.58, 4,465.27 and 1,129.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.58 : 4,465.27 = 1,129.21 : x
2. Step 2: Convert to fraction form
   2,978.58/4,465.27 = 1,129.21/x
3. Step 3: Cross multiply
   2,978.58x = 4,465.27 × 1,129.21
4. Step 4: Simplify right side
   2,978.58x = 5,042,227.54
5. Step 5: Solve for x
   x = 5,042,227.54/2,978.58
6. Step 6: Final answer
   x = 1,692.83