Finding the Fourth Proportional to 2,523.72, 3,482.79 and 1,389.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,523.72 : 3,482.79 = 1,389.45 : x
2. Step 2: Convert to fraction form
   2,523.72/3,482.79 = 1,389.45/x
3. Step 3: Cross multiply
   2,523.72x = 3,482.79 × 1,389.45
4. Step 4: Simplify right side
   2,523.72x = 4,839,162.57
5. Step 5: Solve for x
   x = 4,839,162.57/2,523.72
6. Step 6: Final answer
   x = 1,917.47