Finding the Fourth Proportional to 3,953.49, 5,929.56 and 1,320.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,953.49 : 5,929.56 = 1,320.81 : x
2. Step 2: Convert to fraction form
   3,953.49/5,929.56 = 1,320.81/x
3. Step 3: Cross multiply
   3,953.49x = 5,929.56 × 1,320.81
4. Step 4: Simplify right side
   3,953.49x = 7,831,822.14
5. Step 5: Solve for x
   x = 7,831,822.14/3,953.49
6. Step 6: Final answer
   x = 1,980.99