Finding the Fourth Proportional to 1,056.46, 1,457.91 and 608.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.46 : 1,457.91 = 608.42 : x
2. Step 2: Convert to fraction form
   1,056.46/1,457.91 = 608.42/x
3. Step 3: Cross multiply
   1,056.46x = 1,457.91 × 608.42
4. Step 4: Simplify right side
   1,056.46x = 887,021.60
5. Step 5: Solve for x
   x = 887,021.60/1,056.46
6. Step 6: Final answer
   x = 839.62