Finding the Fourth Proportional to 5,309.82, 7,965.12 and 1,611.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,309.82 : 7,965.12 = 1,611.72 : x
2. Step 2: Convert to fraction form
   5,309.82/7,965.12 = 1,611.72/x
3. Step 3: Cross multiply
   5,309.82x = 7,965.12 × 1,611.72
4. Step 4: Simplify right side
   5,309.82x = 12,837,543.21
5. Step 5: Solve for x
   x = 12,837,543.21/5,309.82
6. Step 6: Final answer
   x = 2,417.70