Finding the Fourth Proportional to 1,131.05, 1,696.01 and 721.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.05 : 1,696.01 = 721.01 : x
2. Step 2: Convert to fraction form
   1,131.05/1,696.01 = 721.01/x
3. Step 3: Cross multiply
   1,131.05x = 1,696.01 × 721.01
4. Step 4: Simplify right side
   1,131.05x = 1,222,840.17
5. Step 5: Solve for x
   x = 1,222,840.17/1,131.05
6. Step 6: Final answer
   x = 1,081.15