Finding the Fourth Proportional to 2,970.77, 4,456.77 and 890.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,970.77 : 4,456.77 = 890.69 : x
2. Step 2: Convert to fraction form
   2,970.77/4,456.77 = 890.69/x
3. Step 3: Cross multiply
   2,970.77x = 4,456.77 × 890.69
4. Step 4: Simplify right side
   2,970.77x = 3,969,600.47
5. Step 5: Solve for x
   x = 3,969,600.47/2,970.77
6. Step 6: Final answer
   x = 1,336.22