Finding the Fourth Proportional to 2,091.78, 3,138.70 and 1,479.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.78 : 3,138.70 = 1,479.42 : x
2. Step 2: Convert to fraction form
   2,091.78/3,138.70 = 1,479.42/x
3. Step 3: Cross multiply
   2,091.78x = 3,138.70 × 1,479.42
4. Step 4: Simplify right side
   2,091.78x = 4,643,455.55
5. Step 5: Solve for x
   x = 4,643,455.55/2,091.78
6. Step 6: Final answer
   x = 2,219.86