Finding the Fourth Proportional to 1,309.67, 1,963.42 and 539.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.67 : 1,963.42 = 539.63 : x
2. Step 2: Convert to fraction form
   1,309.67/1,963.42 = 539.63/x
3. Step 3: Cross multiply
   1,309.67x = 1,963.42 × 539.63
4. Step 4: Simplify right side
   1,309.67x = 1,059,509.17
5. Step 5: Solve for x
   x = 1,059,509.17/1,309.67
6. Step 6: Final answer
   x = 808.99