Finding the Fourth Proportional to 2,385.48, 3,576.69 and 999.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.48 : 3,576.69 = 999.80 : x
2. Step 2: Convert to fraction form
   2,385.48/3,576.69 = 999.80/x
3. Step 3: Cross multiply
   2,385.48x = 3,576.69 × 999.80
4. Step 4: Simplify right side
   2,385.48x = 3,575,956.78
5. Step 5: Solve for x
   x = 3,575,956.78/2,385.48
6. Step 6: Final answer
   x = 1,499.05