Finding the Fourth Proportional to 1,528.22, 2,109.06 and 938.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.22 : 2,109.06 = 938.85 : x
2. Step 2: Convert to fraction form
   1,528.22/2,109.06 = 938.85/x
3. Step 3: Cross multiply
   1,528.22x = 2,109.06 × 938.85
4. Step 4: Simplify right side
   1,528.22x = 1,980,090.98
5. Step 5: Solve for x
   x = 1,980,090.98/1,528.22
6. Step 6: Final answer
   x = 1,295.69