Finding the Fourth Proportional to 1,371.12, 1,891.74 and 1,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.12 : 1,891.74 = 1,056.72 : x
2. Step 2: Convert to fraction form
   1,371.12/1,891.74 = 1,056.72/x
3. Step 3: Cross multiply
   1,371.12x = 1,891.74 × 1,056.72
4. Step 4: Simplify right side
   1,371.12x = 1,999,039.49
5. Step 5: Solve for x
   x = 1,999,039.49/1,371.12
6. Step 6: Final answer
   x = 1,457.96