Finding the Fourth Proportional to 2,385.45, 3,578.85 and 742.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.45 : 3,578.85 = 742.10 : x
2. Step 2: Convert to fraction form
   2,385.45/3,578.85 = 742.10/x
3. Step 3: Cross multiply
   2,385.45x = 3,578.85 × 742.10
4. Step 4: Simplify right side
   2,385.45x = 2,655,846.69
5. Step 5: Solve for x
   x = 2,655,846.69/2,385.45
6. Step 6: Final answer
   x = 1,113.35