Finding the Fourth Proportional to 2,385.95, 3,579.83 and 925.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.95 : 3,579.83 = 925.20 : x
2. Step 2: Convert to fraction form
   2,385.95/3,579.83 = 925.20/x
3. Step 3: Cross multiply
   2,385.95x = 3,579.83 × 925.20
4. Step 4: Simplify right side
   2,385.95x = 3,312,054.09
5. Step 5: Solve for x
   x = 3,312,054.09/2,385.95
6. Step 6: Final answer
   x = 1,388.15