Finding the Fourth Proportional to 2,387.60, 3,581.56 and 999.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.60 : 3,581.56 = 999.53 : x
2. Step 2: Convert to fraction form
   2,387.60/3,581.56 = 999.53/x
3. Step 3: Cross multiply
   2,387.60x = 3,581.56 × 999.53
4. Step 4: Simplify right side
   2,387.60x = 3,579,876.67
5. Step 5: Solve for x
   x = 3,579,876.67/2,387.60
6. Step 6: Final answer
   x = 1,499.37