Finding the Fourth Proportional to 1,356.76, 1,871.56 and 1,006.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.76 : 1,871.56 = 1,006.84 : x
2. Step 2: Convert to fraction form
   1,356.76/1,871.56 = 1,006.84/x
3. Step 3: Cross multiply
   1,356.76x = 1,871.56 × 1,006.84
4. Step 4: Simplify right side
   1,356.76x = 1,884,361.47
5. Step 5: Solve for x
   x = 1,884,361.47/1,356.76
6. Step 6: Final answer
   x = 1,388.87