Finding the Fourth Proportional to 1,071.69, 1,606.72 and 1,019.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.69 : 1,606.72 = 1,019.78 : x
2. Step 2: Convert to fraction form
   1,071.69/1,606.72 = 1,019.78/x
3. Step 3: Cross multiply
   1,071.69x = 1,606.72 × 1,019.78
4. Step 4: Simplify right side
   1,071.69x = 1,638,500.92
5. Step 5: Solve for x
   x = 1,638,500.92/1,071.69
6. Step 6: Final answer
   x = 1,528.89