Finding the Fourth Proportional to 1,427.88, 1,969.58 and 838.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.88 : 1,969.58 = 838.28 : x
2. Step 2: Convert to fraction form
   1,427.88/1,969.58 = 838.28/x
3. Step 3: Cross multiply
   1,427.88x = 1,969.58 × 838.28
4. Step 4: Simplify right side
   1,427.88x = 1,651,059.52
5. Step 5: Solve for x
   x = 1,651,059.52/1,427.88
6. Step 6: Final answer
   x = 1,156.30