Finding the Fourth Proportional to 1,990.17, 2,986.17 and 757.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.17 : 2,986.17 = 757.86 : x
2. Step 2: Convert to fraction form
   1,990.17/2,986.17 = 757.86/x
3. Step 3: Cross multiply
   1,990.17x = 2,986.17 × 757.86
4. Step 4: Simplify right side
   1,990.17x = 2,263,084.76
5. Step 5: Solve for x
   x = 2,263,084.76/1,990.17
6. Step 6: Final answer
   x = 1,137.13