Finding the Fourth Proportional to 2,460.72, 3,691.32 and 921.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,460.72 : 3,691.32 = 921.72 : x
2. Step 2: Convert to fraction form
   2,460.72/3,691.32 = 921.72/x
3. Step 3: Cross multiply
   2,460.72x = 3,691.32 × 921.72
4. Step 4: Simplify right side
   2,460.72x = 3,402,363.47
5. Step 5: Solve for x
   x = 3,402,363.47/2,460.72
6. Step 6: Final answer
   x = 1,382.67