Finding the Fourth Proportional to 1,128.65, 1,693.61 and 608.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.65 : 1,693.61 = 608.64 : x
2. Step 2: Convert to fraction form
   1,128.65/1,693.61 = 608.64/x
3. Step 3: Cross multiply
   1,128.65x = 1,693.61 × 608.64
4. Step 4: Simplify right side
   1,128.65x = 1,030,804.55
5. Step 5: Solve for x
   x = 1,030,804.55/1,128.65
6. Step 6: Final answer
   x = 913.31