Finding the Fourth Proportional to 1,987.14, 2,978.46 and 1,011.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.14 : 2,978.46 = 1,011.18 : x
2. Step 2: Convert to fraction form
   1,987.14/2,978.46 = 1,011.18/x
3. Step 3: Cross multiply
   1,987.14x = 2,978.46 × 1,011.18
4. Step 4: Simplify right side
   1,987.14x = 3,011,759.18
5. Step 5: Solve for x
   x = 3,011,759.18/1,987.14
6. Step 6: Final answer
   x = 1,515.63