Finding the Fourth Proportional to 1,600.80, 2,209.76 and 1,434.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,600.80 : 2,209.76 = 1,434.72 : x
2. Step 2: Convert to fraction form
   1,600.80/2,209.76 = 1,434.72/x
3. Step 3: Cross multiply
   1,600.80x = 2,209.76 × 1,434.72
4. Step 4: Simplify right side
   1,600.80x = 3,170,386.87
5. Step 5: Solve for x
   x = 3,170,386.87/1,600.80
6. Step 6: Final answer
   x = 1,980.50