Finding the Fourth Proportional to 1,520.60, 2,279.12 and 698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.60 : 2,279.12 = 698.72 : x
2. Step 2: Convert to fraction form
   1,520.60/2,279.12 = 698.72/x
3. Step 3: Cross multiply
   1,520.60x = 2,279.12 × 698.72
4. Step 4: Simplify right side
   1,520.60x = 1,592,466.73
5. Step 5: Solve for x
   x = 1,592,466.73/1,520.60
6. Step 6: Final answer
   x = 1,047.26