Finding the Fourth Proportional to 2,655.10, 3,984.47 and 923.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655.10 : 3,984.47 = 923.72 : x
2. Step 2: Convert to fraction form
   2,655.10/3,984.47 = 923.72/x
3. Step 3: Cross multiply
   2,655.10x = 3,984.47 × 923.72
4. Step 4: Simplify right side
   2,655.10x = 3,680,534.63
5. Step 5: Solve for x
   x = 3,680,534.63/2,655.10
6. Step 6: Final answer
   x = 1,386.21