Finding the Fourth Proportional to 1,410.72, 2,111.16 and 1,388.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.72 : 2,111.16 = 1,388.88 : x
2. Step 2: Convert to fraction form
   1,410.72/2,111.16 = 1,388.88/x
3. Step 3: Cross multiply
   1,410.72x = 2,111.16 × 1,388.88
4. Step 4: Simplify right side
   1,410.72x = 2,932,147.90
5. Step 5: Solve for x
   x = 2,932,147.90/1,410.72
6. Step 6: Final answer
   x = 2,078.48