Finding the Fourth Proportional to 1,391.84, 2,085.04 and 1,131.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.84 : 2,085.04 = 1,131.76 : x
2. Step 2: Convert to fraction form
   1,391.84/2,085.04 = 1,131.76/x
3. Step 3: Cross multiply
   1,391.84x = 2,085.04 × 1,131.76
4. Step 4: Simplify right side
   1,391.84x = 2,359,764.87
5. Step 5: Solve for x
   x = 2,359,764.87/1,391.84
6. Step 6: Final answer
   x = 1,695.43