Finding the Fourth Proportional to 4,990.50, 7,485.72 and 1,292.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,990.50 : 7,485.72 = 1,292.72 : x
2. Step 2: Convert to fraction form
   4,990.50/7,485.72 = 1,292.72/x
3. Step 3: Cross multiply
   4,990.50x = 7,485.72 × 1,292.72
4. Step 4: Simplify right side
   4,990.50x = 9,676,902.53
5. Step 5: Solve for x
   x = 9,676,902.53/4,990.50
6. Step 6: Final answer
   x = 1,939.06