Finding the Fourth Proportional to 1,478.58, 2,218.59 and 698.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.58 : 2,218.59 = 698.55 : x
2. Step 2: Convert to fraction form
   1,478.58/2,218.59 = 698.55/x
3. Step 3: Cross multiply
   1,478.58x = 2,218.59 × 698.55
4. Step 4: Simplify right side
   1,478.58x = 1,549,796.04
5. Step 5: Solve for x
   x = 1,549,796.04/1,478.58
6. Step 6: Final answer
   x = 1,048.17