Finding the Fourth Proportional to 1,381.34, 2,072.34 and 991.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.34 : 2,072.34 = 991.52 : x
2. Step 2: Convert to fraction form
   1,381.34/2,072.34 = 991.52/x
3. Step 3: Cross multiply
   1,381.34x = 2,072.34 × 991.52
4. Step 4: Simplify right side
   1,381.34x = 2,054,766.56
5. Step 5: Solve for x
   x = 2,054,766.56/1,381.34
6. Step 6: Final answer
   x = 1,487.52