Finding the Fourth Proportional to 1,405.98, 1,940.10 and 1,056.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.98 : 1,940.10 = 1,056.06 : x
2. Step 2: Convert to fraction form
   1,405.98/1,940.10 = 1,056.06/x
3. Step 3: Cross multiply
   1,405.98x = 1,940.10 × 1,056.06
4. Step 4: Simplify right side
   1,405.98x = 2,048,862.01
5. Step 5: Solve for x
   x = 2,048,862.01/1,405.98
6. Step 6: Final answer
   x = 1,457.25