Finding the Fourth Proportional to 1,453.82, 2,180.33 and 991.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,453.82 : 2,180.33 = 991.51 : x
2. Step 2: Convert to fraction form
   1,453.82/2,180.33 = 991.51/x
3. Step 3: Cross multiply
   1,453.82x = 2,180.33 × 991.51
4. Step 4: Simplify right side
   1,453.82x = 2,161,812.31
5. Step 5: Solve for x
   x = 2,161,812.31/1,453.82
6. Step 6: Final answer
   x = 1,486.99