Finding the Fourth Proportional to 1,994.80, 2,991.48 and 1,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,994.80 : 2,991.48 = 1,020.72 : x
2. Step 2: Convert to fraction form
   1,994.80/2,991.48 = 1,020.72/x
3. Step 3: Cross multiply
   1,994.80x = 2,991.48 × 1,020.72
4. Step 4: Simplify right side
   1,994.80x = 3,053,463.47
5. Step 5: Solve for x
   x = 3,053,463.47/1,994.80
6. Step 6: Final answer
   x = 1,530.71