Finding the Fourth Proportional to 1,372.69, 2,056.94 and 816.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.69 : 2,056.94 = 816.29 : x
2. Step 2: Convert to fraction form
   1,372.69/2,056.94 = 816.29/x
3. Step 3: Cross multiply
   1,372.69x = 2,056.94 × 816.29
4. Step 4: Simplify right side
   1,372.69x = 1,679,059.55
5. Step 5: Solve for x
   x = 1,679,059.55/1,372.69
6. Step 6: Final answer
   x = 1,223.19