Finding the Fourth Proportional to 1,643.85, 2,461.86 and 949.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.85 : 2,461.86 = 949.05 : x
2. Step 2: Convert to fraction form
   1,643.85/2,461.86 = 949.05/x
3. Step 3: Cross multiply
   1,643.85x = 2,461.86 × 949.05
4. Step 4: Simplify right side
   1,643.85x = 2,336,428.23
5. Step 5: Solve for x
   x = 2,336,428.23/1,643.85
6. Step 6: Final answer
   x = 1,421.31