Finding the Fourth Proportional to 1,082.79, 1,623.72 and 342.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.79 : 1,623.72 = 342.15 : x
2. Step 2: Convert to fraction form
   1,082.79/1,623.72 = 342.15/x
3. Step 3: Cross multiply
   1,082.79x = 1,623.72 × 342.15
4. Step 4: Simplify right side
   1,082.79x = 555,555.80
5. Step 5: Solve for x
   x = 555,555.80/1,082.79
6. Step 6: Final answer
   x = 513.08