Finding the Fourth Proportional to 1,987.18, 2,978.82 and 1,110.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.18 : 2,978.82 = 1,110.10 : x
2. Step 2: Convert to fraction form
   1,987.18/2,978.82 = 1,110.10/x
3. Step 3: Cross multiply
   1,987.18x = 2,978.82 × 1,110.10
4. Step 4: Simplify right side
   1,987.18x = 3,306,792.77
5. Step 5: Solve for x
   x = 3,306,792.77/1,987.18
6. Step 6: Final answer
   x = 1,664.06