Finding the Fourth Proportional to 2,072.32, 3,111.72 and 1,380.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.32 : 3,111.72 = 1,380.64 : x
2. Step 2: Convert to fraction form
   2,072.32/3,111.72 = 1,380.64/x
3. Step 3: Cross multiply
   2,072.32x = 3,111.72 × 1,380.64
4. Step 4: Simplify right side
   2,072.32x = 4,296,165.10
5. Step 5: Solve for x
   x = 4,296,165.10/2,072.32
6. Step 6: Final answer
   x = 2,073.12