Finding the Fourth Proportional to 2,558.06, 3,529.88 and 1,438.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.06 : 3,529.88 = 1,438.91 : x
2. Step 2: Convert to fraction form
   2,558.06/3,529.88 = 1,438.91/x
3. Step 3: Cross multiply
   2,558.06x = 3,529.88 × 1,438.91
4. Step 4: Simplify right side
   2,558.06x = 5,079,154.79
5. Step 5: Solve for x
   x = 5,079,154.79/2,558.06
6. Step 6: Final answer
   x = 1,985.55