Finding the Fourth Proportional to 1,528.26, 2,106.72 and 938.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.26 : 2,106.72 = 938.34 : x
2. Step 2: Convert to fraction form
   1,528.26/2,106.72 = 938.34/x
3. Step 3: Cross multiply
   1,528.26x = 2,106.72 × 938.34
4. Step 4: Simplify right side
   1,528.26x = 1,976,819.64
5. Step 5: Solve for x
   x = 1,976,819.64/1,528.26
6. Step 6: Final answer
   x = 1,293.51