Finding the Fourth Proportional to 1,478.54, 2,217.65 and 698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.54 : 2,217.65 = 698.72 : x
2. Step 2: Convert to fraction form
   1,478.54/2,217.65 = 698.72/x
3. Step 3: Cross multiply
   1,478.54x = 2,217.65 × 698.72
4. Step 4: Simplify right side
   1,478.54x = 1,549,501.83
5. Step 5: Solve for x
   x = 1,549,501.83/1,478.54
6. Step 6: Final answer
   x = 1,047.99