Finding the Fourth Proportional to 1,984.94, 2,978.78 and 890.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.94 : 2,978.78 = 890.53 : x
2. Step 2: Convert to fraction form
   1,984.94/2,978.78 = 890.53/x
3. Step 3: Cross multiply
   1,984.94x = 2,978.78 × 890.53
4. Step 4: Simplify right side
   1,984.94x = 2,652,681.05
5. Step 5: Solve for x
   x = 2,652,681.05/1,984.94
6. Step 6: Final answer
   x = 1,336.40