Finding the Fourth Proportional to 1,528.68, 2,109.56 and 830.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.68 : 2,109.56 = 830.06 : x
2. Step 2: Convert to fraction form
   1,528.68/2,109.56 = 830.06/x
3. Step 3: Cross multiply
   1,528.68x = 2,109.56 × 830.06
4. Step 4: Simplify right side
   1,528.68x = 1,751,061.37
5. Step 5: Solve for x
   x = 1,751,061.37/1,528.68
6. Step 6: Final answer
   x = 1,145.47