Finding the Fourth Proportional to 1,424.34, 1,961.28 and 1,187.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.34 : 1,961.28 = 1,187.82 : x
2. Step 2: Convert to fraction form
   1,424.34/1,961.28 = 1,187.82/x
3. Step 3: Cross multiply
   1,424.34x = 1,961.28 × 1,187.82
4. Step 4: Simplify right side
   1,424.34x = 2,329,647.61
5. Step 5: Solve for x
   x = 2,329,647.61/1,424.34
6. Step 6: Final answer
   x = 1,635.60