Finding the Fourth Proportional to 1,322.82, 1,980.72 and 1,116.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.82 : 1,980.72 = 1,116.90 : x
2. Step 2: Convert to fraction form
   1,322.82/1,980.72 = 1,116.90/x
3. Step 3: Cross multiply
   1,322.82x = 1,980.72 × 1,116.90
4. Step 4: Simplify right side
   1,322.82x = 2,212,266.17
5. Step 5: Solve for x
   x = 2,212,266.17/1,322.82
6. Step 6: Final answer
   x = 1,672.39