Finding the Fourth Proportional to 1,372.46, 2,054.79 and 1,242.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.46 : 2,054.79 = 1,242.72 : x
2. Step 2: Convert to fraction form
   1,372.46/2,054.79 = 1,242.72/x
3. Step 3: Cross multiply
   1,372.46x = 2,054.79 × 1,242.72
4. Step 4: Simplify right side
   1,372.46x = 2,553,528.63
5. Step 5: Solve for x
   x = 2,553,528.63/1,372.46
6. Step 6: Final answer
   x = 1,860.56