Finding the Fourth Proportional to 1,528.69, 2,109.60 and 830.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.69 : 2,109.60 = 830.07 : x
2. Step 2: Convert to fraction form
   1,528.69/2,109.60 = 830.07/x
3. Step 3: Cross multiply
   1,528.69x = 2,109.60 × 830.07
4. Step 4: Simplify right side
   1,528.69x = 1,751,105.12
5. Step 5: Solve for x
   x = 1,751,105.12/1,528.69
6. Step 6: Final answer
   x = 1,145.49