Finding the Fourth Proportional to 2,308.05, 3,460.64 and 921.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.05 : 3,460.64 = 921.60 : x
2. Step 2: Convert to fraction form
   2,308.05/3,460.64 = 921.60/x
3. Step 3: Cross multiply
   2,308.05x = 3,460.64 × 921.60
4. Step 4: Simplify right side
   2,308.05x = 3,189,321.22
5. Step 5: Solve for x
   x = 3,189,321.22/2,308.05
6. Step 6: Final answer
   x = 1,381.83