Finding the Fourth Proportional to 1,645.72, 2,271.96 and 1,308.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.72 : 2,271.96 = 1,308.96 : x
2. Step 2: Convert to fraction form
   1,645.72/2,271.96 = 1,308.96/x
3. Step 3: Cross multiply
   1,645.72x = 2,271.96 × 1,308.96
4. Step 4: Simplify right side
   1,645.72x = 2,973,904.76
5. Step 5: Solve for x
   x = 2,973,904.76/1,645.72
6. Step 6: Final answer
   x = 1,807.05