Finding the Fourth Proportional to 1,390.32, 1,918.69 and 760.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.32 : 1,918.69 = 760.81 : x
2. Step 2: Convert to fraction form
   1,390.32/1,918.69 = 760.81/x
3. Step 3: Cross multiply
   1,390.32x = 1,918.69 × 760.81
4. Step 4: Simplify right side
   1,390.32x = 1,459,754.69
5. Step 5: Solve for x
   x = 1,459,754.69/1,390.32
6. Step 6: Final answer
   x = 1,049.94