Finding the Fourth Proportional to 1,048.20, 1,570.17 and 498.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.20 : 1,570.17 = 498.72 : x
2. Step 2: Convert to fraction form
   1,048.20/1,570.17 = 498.72/x
3. Step 3: Cross multiply
   1,048.20x = 1,570.17 × 498.72
4. Step 4: Simplify right side
   1,048.20x = 783,075.18
5. Step 5: Solve for x
   x = 783,075.18/1,048.20
6. Step 6: Final answer
   x = 747.07