Finding the Fourth Proportional to 1,061.40, 1,590.88 and 670.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.40 : 1,590.88 = 670.44 : x
2. Step 2: Convert to fraction form
   1,061.40/1,590.88 = 670.44/x
3. Step 3: Cross multiply
   1,061.40x = 1,590.88 × 670.44
4. Step 4: Simplify right side
   1,061.40x = 1,066,589.59
5. Step 5: Solve for x
   x = 1,066,589.59/1,061.40
6. Step 6: Final answer
   x = 1,004.89