Finding the Fourth Proportional to 1,528.72, 2,108.77 and 938.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.72 : 2,108.77 = 938.84 : x
2. Step 2: Convert to fraction form
   1,528.72/2,108.77 = 938.84/x
3. Step 3: Cross multiply
   1,528.72x = 2,108.77 × 938.84
4. Step 4: Simplify right side
   1,528.72x = 1,979,784.74
5. Step 5: Solve for x
   x = 1,979,784.74/1,528.72
6. Step 6: Final answer
   x = 1,295.06