Finding the Fourth Proportional to 1,288.72, 1,933.87 and 508.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.72 : 1,933.87 = 508.59 : x
2. Step 2: Convert to fraction form
   1,288.72/1,933.87 = 508.59/x
3. Step 3: Cross multiply
   1,288.72x = 1,933.87 × 508.59
4. Step 4: Simplify right side
   1,288.72x = 983,541.90
5. Step 5: Solve for x
   x = 983,541.90/1,288.72
6. Step 6: Final answer
   x = 763.19