Finding the Fourth Proportional to 1,188.02, 1,639.42 and 656.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188.02 : 1,639.42 = 656.89 : x
2. Step 2: Convert to fraction form
   1,188.02/1,639.42 = 656.89/x
3. Step 3: Cross multiply
   1,188.02x = 1,639.42 × 656.89
4. Step 4: Simplify right side
   1,188.02x = 1,076,912.86
5. Step 5: Solve for x
   x = 1,076,912.86/1,188.02
6. Step 6: Final answer
   x = 906.48