Finding the Fourth Proportional to 1,334.40, 1,991.33 and 1,172.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.40 : 1,991.33 = 1,172.43 : x
2. Step 2: Convert to fraction form
   1,334.40/1,991.33 = 1,172.43/x
3. Step 3: Cross multiply
   1,334.40x = 1,991.33 × 1,172.43
4. Step 4: Simplify right side
   1,334.40x = 2,334,689.17
5. Step 5: Solve for x
   x = 2,334,689.17/1,334.40
6. Step 6: Final answer
   x = 1,749.62