Finding the Fourth Proportional to 1,004.79, 1,384.86 and 817.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.79 : 1,384.86 = 817.89 : x
2. Step 2: Convert to fraction form
   1,004.79/1,384.86 = 817.89/x
3. Step 3: Cross multiply
   1,004.79x = 1,384.86 × 817.89
4. Step 4: Simplify right side
   1,004.79x = 1,132,663.15
5. Step 5: Solve for x
   x = 1,132,663.15/1,004.79
6. Step 6: Final answer
   x = 1,127.26