Finding the Fourth Proportional to 1,109.31, 1,659.78 and 670.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.31 : 1,659.78 = 670.70 : x
2. Step 2: Convert to fraction form
   1,109.31/1,659.78 = 670.70/x
3. Step 3: Cross multiply
   1,109.31x = 1,659.78 × 670.70
4. Step 4: Simplify right side
   1,109.31x = 1,113,206.15
5. Step 5: Solve for x
   x = 1,113,206.15/1,109.31
6. Step 6: Final answer
   x = 1,003.51