Finding the Fourth Proportional to 1,398.45, 1,931.41 and 955.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.45 : 1,931.41 = 955.59 : x
2. Step 2: Convert to fraction form
   1,398.45/1,931.41 = 955.59/x
3. Step 3: Cross multiply
   1,398.45x = 1,931.41 × 955.59
4. Step 4: Simplify right side
   1,398.45x = 1,845,636.08
5. Step 5: Solve for x
   x = 1,845,636.08/1,398.45
6. Step 6: Final answer
   x = 1,319.77