Finding the Fourth Proportional to 1,019.69, 1,520.95 and 988.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.69 : 1,520.95 = 988.93 : x
2. Step 2: Convert to fraction form
   1,019.69/1,520.95 = 988.93/x
3. Step 3: Cross multiply
   1,019.69x = 1,520.95 × 988.93
4. Step 4: Simplify right side
   1,019.69x = 1,504,121.43
5. Step 5: Solve for x
   x = 1,504,121.43/1,019.69
6. Step 6: Final answer
   x = 1,475.08