Finding the Fourth Proportional to 2,130.32, 2,938.88 and 1,245.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.32 : 2,938.88 = 1,245.72 : x
2. Step 2: Convert to fraction form
   2,130.32/2,938.88 = 1,245.72/x
3. Step 3: Cross multiply
   2,130.32x = 2,938.88 × 1,245.72
4. Step 4: Simplify right side
   2,130.32x = 3,661,021.59
5. Step 5: Solve for x
   x = 3,661,021.59/2,130.32
6. Step 6: Final answer
   x = 1,718.53