Finding the Fourth Proportional to 2,385.47, 3,579.60 and 998.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.47 : 3,579.60 = 998.69 : x
2. Step 2: Convert to fraction form
   2,385.47/3,579.60 = 998.69/x
3. Step 3: Cross multiply
   2,385.47x = 3,579.60 × 998.69
4. Step 4: Simplify right side
   2,385.47x = 3,574,892.83
5. Step 5: Solve for x
   x = 3,574,892.83/2,385.47
6. Step 6: Final answer
   x = 1,498.61