Finding the Fourth Proportional to 1,618.10, 2,429.58 and 925.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.10 : 2,429.58 = 925.55 : x
2. Step 2: Convert to fraction form
   1,618.10/2,429.58 = 925.55/x
3. Step 3: Cross multiply
   1,618.10x = 2,429.58 × 925.55
4. Step 4: Simplify right side
   1,618.10x = 2,248,707.31
5. Step 5: Solve for x
   x = 2,248,707.31/1,618.10
6. Step 6: Final answer
   x = 1,389.72