Finding the Fourth Proportional to 2,990.18, 4,128.37 and 1,928.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.18 : 4,128.37 = 1,928.48 : x
2. Step 2: Convert to fraction form
   2,990.18/4,128.37 = 1,928.48/x
3. Step 3: Cross multiply
   2,990.18x = 4,128.37 × 1,928.48
4. Step 4: Simplify right side
   2,990.18x = 7,961,453.51
5. Step 5: Solve for x
   x = 7,961,453.51/2,990.18
6. Step 6: Final answer
   x = 2,662.53