Finding the Fourth Proportional to 1,432.33, 1,977.56 and 991.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.33 : 1,977.56 = 991.59 : x
2. Step 2: Convert to fraction form
   1,432.33/1,977.56 = 991.59/x
3. Step 3: Cross multiply
   1,432.33x = 1,977.56 × 991.59
4. Step 4: Simplify right side
   1,432.33x = 1,960,936.77
5. Step 5: Solve for x
   x = 1,960,936.77/1,432.33
6. Step 6: Final answer
   x = 1,369.05