Finding the Fourth Proportional to 1,528.34, 2,109.17 and 938.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.34 : 2,109.17 = 938.77 : x
2. Step 2: Convert to fraction form
   1,528.34/2,109.17 = 938.77/x
3. Step 3: Cross multiply
   1,528.34x = 2,109.17 × 938.77
4. Step 4: Simplify right side
   1,528.34x = 1,980,025.52
5. Step 5: Solve for x
   x = 1,980,025.52/1,528.34
6. Step 6: Final answer
   x = 1,295.54