Finding the Fourth Proportional to 2,087.40, 3,127.05 and 1,161.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.40 : 3,127.05 = 1,161.30 : x
2. Step 2: Convert to fraction form
   2,087.40/3,127.05 = 1,161.30/x
3. Step 3: Cross multiply
   2,087.40x = 3,127.05 × 1,161.30
4. Step 4: Simplify right side
   2,087.40x = 3,631,443.17
5. Step 5: Solve for x
   x = 3,631,443.17/2,087.40
6. Step 6: Final answer
   x = 1,739.70