Finding the Fourth Proportional to 1,990.35, 2,978.02 and 1,788.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.35 : 2,978.02 = 1,788.25 : x
2. Step 2: Convert to fraction form
   1,990.35/2,978.02 = 1,788.25/x
3. Step 3: Cross multiply
   1,990.35x = 2,978.02 × 1,788.25
4. Step 4: Simplify right side
   1,990.35x = 5,325,444.27
5. Step 5: Solve for x
   x = 5,325,444.27/1,990.35
6. Step 6: Final answer
   x = 2,675.63