Finding the Fourth Proportional to 1,428.26, 2,141.60 and 724.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.26 : 2,141.60 = 724.82 : x
2. Step 2: Convert to fraction form
   1,428.26/2,141.60 = 724.82/x
3. Step 3: Cross multiply
   1,428.26x = 2,141.60 × 724.82
4. Step 4: Simplify right side
   1,428.26x = 1,552,274.51
5. Step 5: Solve for x
   x = 1,552,274.51/1,428.26
6. Step 6: Final answer
   x = 1,086.83