Finding the Fourth Proportional to 1,128.69, 1,688.18 and 1,004.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.69 : 1,688.18 = 1,004.49 : x
2. Step 2: Convert to fraction form
   1,128.69/1,688.18 = 1,004.49/x
3. Step 3: Cross multiply
   1,128.69x = 1,688.18 × 1,004.49
4. Step 4: Simplify right side
   1,128.69x = 1,695,762.89
5. Step 5: Solve for x
   x = 1,695,762.89/1,128.69
6. Step 6: Final answer
   x = 1,502.41