Finding the Fourth Proportional to 3,404.72, 5,106.66 and 939.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,404.72 : 5,106.66 = 939.69 : x
2. Step 2: Convert to fraction form
   3,404.72/5,106.66 = 939.69/x
3. Step 3: Cross multiply
   3,404.72x = 5,106.66 × 939.69
4. Step 4: Simplify right side
   3,404.72x = 4,798,677.34
5. Step 5: Solve for x
   x = 4,798,677.34/3,404.72
6. Step 6: Final answer
   x = 1,409.42