Finding the Fourth Proportional to 2,913.77, 4,370.72 and 939.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,913.77 : 4,370.72 = 939.57 : x
2. Step 2: Convert to fraction form
   2,913.77/4,370.72 = 939.57/x
3. Step 3: Cross multiply
   2,913.77x = 4,370.72 × 939.57
4. Step 4: Simplify right side
   2,913.77x = 4,106,592.69
5. Step 5: Solve for x
   x = 4,106,592.69/2,913.77
6. Step 6: Final answer
   x = 1,409.38