Finding the Fourth Proportional to 1,428.03, 1,969.88 and 838.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.03 : 1,969.88 = 838.46 : x
2. Step 2: Convert to fraction form
   1,428.03/1,969.88 = 838.46/x
3. Step 3: Cross multiply
   1,428.03x = 1,969.88 × 838.46
4. Step 4: Simplify right side
   1,428.03x = 1,651,651.54
5. Step 5: Solve for x
   x = 1,651,651.54/1,428.03
6. Step 6: Final answer
   x = 1,156.59