Finding the Fourth Proportional to 1,908.69, 2,861.20 and 933.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,908.69 : 2,861.20 = 933.72 : x
2. Step 2: Convert to fraction form
   1,908.69/2,861.20 = 933.72/x
3. Step 3: Cross multiply
   1,908.69x = 2,861.20 × 933.72
4. Step 4: Simplify right side
   1,908.69x = 2,671,559.66
5. Step 5: Solve for x
   x = 2,671,559.66/1,908.69
6. Step 6: Final answer
   x = 1,399.68