Finding the Fourth Proportional to 1,989.52, 2,742.69 and 1,398.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.52 : 2,742.69 = 1,398.22 : x
2. Step 2: Convert to fraction form
   1,989.52/2,742.69 = 1,398.22/x
3. Step 3: Cross multiply
   1,989.52x = 2,742.69 × 1,398.22
4. Step 4: Simplify right side
   1,989.52x = 3,834,884.82
5. Step 5: Solve for x
   x = 3,834,884.82/1,989.52
6. Step 6: Final answer
   x = 1,927.54