Finding the Fourth Proportional to 2,659.64, 3,989.62 and 904.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.64 : 3,989.62 = 904.15 : x
2. Step 2: Convert to fraction form
   2,659.64/3,989.62 = 904.15/x
3. Step 3: Cross multiply
   2,659.64x = 3,989.62 × 904.15
4. Step 4: Simplify right side
   2,659.64x = 3,607,217.34
5. Step 5: Solve for x
   x = 3,607,217.34/2,659.64
6. Step 6: Final answer
   x = 1,356.28