Finding the Fourth Proportional to 1,398.04, 1,925.72 and 1,161.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.04 : 1,925.72 = 1,161.56 : x
2. Step 2: Convert to fraction form
   1,398.04/1,925.72 = 1,161.56/x
3. Step 3: Cross multiply
   1,398.04x = 1,925.72 × 1,161.56
4. Step 4: Simplify right side
   1,398.04x = 2,236,839.32
5. Step 5: Solve for x
   x = 2,236,839.32/1,398.04
6. Step 6: Final answer
   x = 1,599.98