Finding the Fourth Proportional to 1,528.72, 2,107.30 and 938.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.72 : 2,107.30 = 938.22 : x
2. Step 2: Convert to fraction form
   1,528.72/2,107.30 = 938.22/x
3. Step 3: Cross multiply
   1,528.72x = 2,107.30 × 938.22
4. Step 4: Simplify right side
   1,528.72x = 1,977,111.01
5. Step 5: Solve for x
   x = 1,977,111.01/1,528.72
6. Step 6: Final answer
   x = 1,293.31