Finding the Fourth Proportional to 1,056.02, 1,457.89 and 636.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.02 : 1,457.89 = 636.45 : x
2. Step 2: Convert to fraction form
   1,056.02/1,457.89 = 636.45/x
3. Step 3: Cross multiply
   1,056.02x = 1,457.89 × 636.45
4. Step 4: Simplify right side
   1,056.02x = 927,873.31
5. Step 5: Solve for x
   x = 927,873.31/1,056.02
6. Step 6: Final answer
   x = 878.65