Finding the Fourth Proportional to 1,188.45, 1,640.52 and 1,063.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188.45 : 1,640.52 = 1,063.89 : x
2. Step 2: Convert to fraction form
   1,188.45/1,640.52 = 1,063.89/x
3. Step 3: Cross multiply
   1,188.45x = 1,640.52 × 1,063.89
4. Step 4: Simplify right side
   1,188.45x = 1,745,332.82
5. Step 5: Solve for x
   x = 1,745,332.82/1,188.45
6. Step 6: Final answer
   x = 1,468.58