Finding the Fourth Proportional to 1,994.57, 2,970.78 and 1,890.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,994.57 : 2,970.78 = 1,890.48 : x
2. Step 2: Convert to fraction form
   1,994.57/2,970.78 = 1,890.48/x
3. Step 3: Cross multiply
   1,994.57x = 2,970.78 × 1,890.48
4. Step 4: Simplify right side
   1,994.57x = 5,616,190.72
5. Step 5: Solve for x
   x = 5,616,190.72/1,994.57
6. Step 6: Final answer
   x = 2,815.75