Finding the Fourth Proportional to 1,407.09, 1,943.50 and 1,054.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.09 : 1,943.50 = 1,054.58 : x
2. Step 2: Convert to fraction form
   1,407.09/1,943.50 = 1,054.58/x
3. Step 3: Cross multiply
   1,407.09x = 1,943.50 × 1,054.58
4. Step 4: Simplify right side
   1,407.09x = 2,049,576.23
5. Step 5: Solve for x
   x = 2,049,576.23/1,407.09
6. Step 6: Final answer
   x = 1,456.61