Finding the Fourth Proportional to 2,143.82, 3,214.31 and 910.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.82 : 3,214.31 = 910.91 : x
2. Step 2: Convert to fraction form
   2,143.82/3,214.31 = 910.91/x
3. Step 3: Cross multiply
   2,143.82x = 3,214.31 × 910.91
4. Step 4: Simplify right side
   2,143.82x = 2,927,926.50
5. Step 5: Solve for x
   x = 2,927,926.50/2,143.82
6. Step 6: Final answer
   x = 1,365.76