Finding the Fourth Proportional to 1,376.45, 1,899.31 and 816.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.45 : 1,899.31 = 816.94 : x
2. Step 2: Convert to fraction form
   1,376.45/1,899.31 = 816.94/x
3. Step 3: Cross multiply
   1,376.45x = 1,899.31 × 816.94
4. Step 4: Simplify right side
   1,376.45x = 1,551,622.31
5. Step 5: Solve for x
   x = 1,551,622.31/1,376.45
6. Step 6: Final answer
   x = 1,127.26