Finding the Fourth Proportional to 2,308.58, 3,460.78 and 921.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.58 : 3,460.78 = 921.63 : x
2. Step 2: Convert to fraction form
   2,308.58/3,460.78 = 921.63/x
3. Step 3: Cross multiply
   2,308.58x = 3,460.78 × 921.63
4. Step 4: Simplify right side
   2,308.58x = 3,189,546.85
5. Step 5: Solve for x
   x = 3,189,546.85/2,308.58
6. Step 6: Final answer
   x = 1,381.60