Finding the Fourth Proportional to 1,940.56, 2,678.03 and 1,056.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.56 : 2,678.03 = 1,056.40 : x
2. Step 2: Convert to fraction form
   1,940.56/2,678.03 = 1,056.40/x
3. Step 3: Cross multiply
   1,940.56x = 2,678.03 × 1,056.40
4. Step 4: Simplify right side
   1,940.56x = 2,829,070.89
5. Step 5: Solve for x
   x = 2,829,070.89/1,940.56
6. Step 6: Final answer
   x = 1,457.86