Finding the Fourth Proportional to 1,528.94, 2,109.93 and 830.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.94 : 2,109.93 = 830.31 : x
2. Step 2: Convert to fraction form
   1,528.94/2,109.93 = 830.31/x
3. Step 3: Cross multiply
   1,528.94x = 2,109.93 × 830.31
4. Step 4: Simplify right side
   1,528.94x = 1,751,895.98
5. Step 5: Solve for x
   x = 1,751,895.98/1,528.94
6. Step 6: Final answer
   x = 1,145.83