Finding the Fourth Proportional to 2,148.69, 2,965.91 and 1,309.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.69 : 2,965.91 = 1,309.94 : x
2. Step 2: Convert to fraction form
   2,148.69/2,965.91 = 1,309.94/x
3. Step 3: Cross multiply
   2,148.69x = 2,965.91 × 1,309.94
4. Step 4: Simplify right side
   2,148.69x = 3,885,142.77
5. Step 5: Solve for x
   x = 3,885,142.77/2,148.69
6. Step 6: Final answer
   x = 1,808.14