Finding the Fourth Proportional to 2,129.51, 2,938.72 and 1,245.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.51 : 2,938.72 = 1,245.14 : x
2. Step 2: Convert to fraction form
   2,129.51/2,938.72 = 1,245.14/x
3. Step 3: Cross multiply
   2,129.51x = 2,938.72 × 1,245.14
4. Step 4: Simplify right side
   2,129.51x = 3,659,096.90
5. Step 5: Solve for x
   x = 3,659,096.90/2,129.51
6. Step 6: Final answer
   x = 1,718.29