Finding the Fourth Proportional to 1,388.82, 2,086.64 and 1,334.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.82 : 2,086.64 = 1,334.15 : x
2. Step 2: Convert to fraction form
   1,388.82/2,086.64 = 1,334.15/x
3. Step 3: Cross multiply
   1,388.82x = 2,086.64 × 1,334.15
4. Step 4: Simplify right side
   1,388.82x = 2,783,890.76
5. Step 5: Solve for x
   x = 2,783,890.76/1,388.82
6. Step 6: Final answer
   x = 2,004.50