Finding the Fourth Proportional to 2,659.42, 3,989.31 and 904.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.42 : 3,989.31 = 904.71 : x
2. Step 2: Convert to fraction form
   2,659.42/3,989.31 = 904.71/x
3. Step 3: Cross multiply
   2,659.42x = 3,989.31 × 904.71
4. Step 4: Simplify right side
   2,659.42x = 3,609,168.65
5. Step 5: Solve for x
   x = 3,609,168.65/2,659.42
6. Step 6: Final answer
   x = 1,357.13