Finding the Fourth Proportional to 1,376.30, 1,899.30 and 816.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.30 : 1,899.30 = 816.76 : x
2. Step 2: Convert to fraction form
   1,376.30/1,899.30 = 816.76/x
3. Step 3: Cross multiply
   1,376.30x = 1,899.30 × 816.76
4. Step 4: Simplify right side
   1,376.30x = 1,551,272.27
5. Step 5: Solve for x
   x = 1,551,272.27/1,376.30
6. Step 6: Final answer
   x = 1,127.13