Finding the Fourth Proportional to 1,081.70, 1,620.63 and 738.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.70 : 1,620.63 = 738.02 : x
2. Step 2: Convert to fraction form
   1,081.70/1,620.63 = 738.02/x
3. Step 3: Cross multiply
   1,081.70x = 1,620.63 × 738.02
4. Step 4: Simplify right side
   1,081.70x = 1,196,057.35
5. Step 5: Solve for x
   x = 1,196,057.35/1,081.70
6. Step 6: Final answer
   x = 1,105.72