Finding the Fourth Proportional to 2,129.50, 2,938.72 and 1,245.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.50 : 2,938.72 = 1,245.12 : x
2. Step 2: Convert to fraction form
   2,129.50/2,938.72 = 1,245.12/x
3. Step 3: Cross multiply
   2,129.50x = 2,938.72 × 1,245.12
4. Step 4: Simplify right side
   2,129.50x = 3,659,059.05
5. Step 5: Solve for x
   x = 3,659,059.05/2,129.50
6. Step 6: Final answer
   x = 1,718.28