Finding the Fourth Proportional to 2,101.66, 3,150.96 and 991.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.66 : 3,150.96 = 991.14 : x
2. Step 2: Convert to fraction form
   2,101.66/3,150.96 = 991.14/x
3. Step 3: Cross multiply
   2,101.66x = 3,150.96 × 991.14
4. Step 4: Simplify right side
   2,101.66x = 3,123,042.49
5. Step 5: Solve for x
   x = 3,123,042.49/2,101.66
6. Step 6: Final answer
   x = 1,485.99