Finding the Fourth Proportional to 1,389.42, 1,904.58 and 1,364.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.42 : 1,904.58 = 1,364.58 : x
2. Step 2: Convert to fraction form
   1,389.42/1,904.58 = 1,364.58/x
3. Step 3: Cross multiply
   1,389.42x = 1,904.58 × 1,364.58
4. Step 4: Simplify right side
   1,389.42x = 2,598,951.78
5. Step 5: Solve for x
   x = 2,598,951.78/1,389.42
6. Step 6: Final answer
   x = 1,870.53