Finding the Fourth Proportional to 1,398.05, 1,929.59 and 1,065.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.05 : 1,929.59 = 1,065.88 : x
2. Step 2: Convert to fraction form
   1,398.05/1,929.59 = 1,065.88/x
3. Step 3: Cross multiply
   1,398.05x = 1,929.59 × 1,065.88
4. Step 4: Simplify right side
   1,398.05x = 2,056,711.39
5. Step 5: Solve for x
   x = 2,056,711.39/1,398.05
6. Step 6: Final answer
   x = 1,471.13