Finding the Fourth Proportional to 2,175.42, 3,002.76 and 1,389.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,175.42 : 3,002.76 = 1,389.33 : x
2. Step 2: Convert to fraction form
   2,175.42/3,002.76 = 1,389.33/x
3. Step 3: Cross multiply
   2,175.42x = 3,002.76 × 1,389.33
4. Step 4: Simplify right side
   2,175.42x = 4,171,824.55
5. Step 5: Solve for x
   x = 4,171,824.55/2,175.42
6. Step 6: Final answer
   x = 1,917.71