Finding the Fourth Proportional to 2,308.42, 3,461.21 and 920.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.42 : 3,461.21 = 920.15 : x
2. Step 2: Convert to fraction form
   2,308.42/3,461.21 = 920.15/x
3. Step 3: Cross multiply
   2,308.42x = 3,461.21 × 920.15
4. Step 4: Simplify right side
   2,308.42x = 3,184,810.47
5. Step 5: Solve for x
   x = 3,184,810.47/2,308.42
6. Step 6: Final answer
   x = 1,379.65