Finding the Fourth Proportional to 1,840.42, 2,539.78 and 1,054.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,840.42 : 2,539.78 = 1,054.47 : x
2. Step 2: Convert to fraction form
   1,840.42/2,539.78 = 1,054.47/x
3. Step 3: Cross multiply
   1,840.42x = 2,539.78 × 1,054.47
4. Step 4: Simplify right side
   1,840.42x = 2,678,116.54
5. Step 5: Solve for x
   x = 2,678,116.54/1,840.42
6. Step 6: Final answer
   x = 1,455.17