Finding the Fourth Proportional to 2,186.69, 3,278.96 and 953.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.69 : 3,278.96 = 953.57 : x
2. Step 2: Convert to fraction form
   2,186.69/3,278.96 = 953.57/x
3. Step 3: Cross multiply
   2,186.69x = 3,278.96 × 953.57
4. Step 4: Simplify right side
   2,186.69x = 3,126,696.72
5. Step 5: Solve for x
   x = 3,126,696.72/2,186.69
6. Step 6: Final answer
   x = 1,429.88