Finding the Fourth Proportional to 1,987.06, 2,978.77 and 1,012.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.06 : 2,978.77 = 1,012.02 : x
2. Step 2: Convert to fraction form
   1,987.06/2,978.77 = 1,012.02/x
3. Step 3: Cross multiply
   1,987.06x = 2,978.77 × 1,012.02
4. Step 4: Simplify right side
   1,987.06x = 3,014,579.73
5. Step 5: Solve for x
   x = 3,014,579.73/1,987.06
6. Step 6: Final answer
   x = 1,517.11