Finding the Fourth Proportional to 1,428.48, 2,137.86 and 1,105.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.48 : 2,137.86 = 1,105.29 : x
2. Step 2: Convert to fraction form
   1,428.48/2,137.86 = 1,105.29/x
3. Step 3: Cross multiply
   1,428.48x = 2,137.86 × 1,105.29
4. Step 4: Simplify right side
   1,428.48x = 2,362,955.28
5. Step 5: Solve for x
   x = 2,362,955.28/1,428.48
6. Step 6: Final answer
   x = 1,654.17