Finding the Fourth Proportional to 1,054.98, 1,581.57 and 406.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.98 : 1,581.57 = 406.17 : x
2. Step 2: Convert to fraction form
   1,054.98/1,581.57 = 406.17/x
3. Step 3: Cross multiply
   1,054.98x = 1,581.57 × 406.17
4. Step 4: Simplify right side
   1,054.98x = 642,386.29
5. Step 5: Solve for x
   x = 642,386.29/1,054.98
6. Step 6: Final answer
   x = 608.91