Finding the Fourth Proportional to 1,007.34, 1,390.33 and 608.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.34 : 1,390.33 = 608.92 : x
2. Step 2: Convert to fraction form
   1,007.34/1,390.33 = 608.92/x
3. Step 3: Cross multiply
   1,007.34x = 1,390.33 × 608.92
4. Step 4: Simplify right side
   1,007.34x = 846,597.03
5. Step 5: Solve for x
   x = 846,597.03/1,007.34
6. Step 6: Final answer
   x = 840.43