Finding the Fourth Proportional to 2,910.18, 4,365.54 and 830.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,910.18 : 4,365.54 = 830.28 : x
2. Step 2: Convert to fraction form
   2,910.18/4,365.54 = 830.28/x
3. Step 3: Cross multiply
   2,910.18x = 4,365.54 × 830.28
4. Step 4: Simplify right side
   2,910.18x = 3,624,620.55
5. Step 5: Solve for x
   x = 3,624,620.55/2,910.18
6. Step 6: Final answer
   x = 1,245.50