Finding the Fourth Proportional to 1,390.55, 2,085.89 and 1,146.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.55 : 2,085.89 = 1,146.62 : x
2. Step 2: Convert to fraction form
   1,390.55/2,085.89 = 1,146.62/x
3. Step 3: Cross multiply
   1,390.55x = 2,085.89 × 1,146.62
4. Step 4: Simplify right side
   1,390.55x = 2,391,722.67
5. Step 5: Solve for x
   x = 2,391,722.67/1,390.55
6. Step 6: Final answer
   x = 1,719.99