Finding the Fourth Proportional to 1,376.71, 1,899.24 and 817.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.71 : 1,899.24 = 817.20 : x
2. Step 2: Convert to fraction form
   1,376.71/1,899.24 = 817.20/x
3. Step 3: Cross multiply
   1,376.71x = 1,899.24 × 817.20
4. Step 4: Simplify right side
   1,376.71x = 1,552,055.86
5. Step 5: Solve for x
   x = 1,552,055.86/1,376.71
6. Step 6: Final answer
   x = 1,127.37