Finding the Fourth Proportional to 2,385.72, 3,579.48 and 924.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.72 : 3,579.48 = 924.96 : x
2. Step 2: Convert to fraction form
   2,385.72/3,579.48 = 924.96/x
3. Step 3: Cross multiply
   2,385.72x = 3,579.48 × 924.96
4. Step 4: Simplify right side
   2,385.72x = 3,310,875.82
5. Step 5: Solve for x
   x = 3,310,875.82/2,385.72
6. Step 6: Final answer
   x = 1,387.79