Finding the Fourth Proportional to 1,055.76, 1,582.72 and 406.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.76 : 1,582.72 = 406.07 : x
2. Step 2: Convert to fraction form
   1,055.76/1,582.72 = 406.07/x
3. Step 3: Cross multiply
   1,055.76x = 1,582.72 × 406.07
4. Step 4: Simplify right side
   1,055.76x = 642,685.17
5. Step 5: Solve for x
   x = 642,685.17/1,055.76
6. Step 6: Final answer
   x = 608.74