Finding the Fourth Proportional to 1,086.63, 1,625.49 and 913.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.63 : 1,625.49 = 913.56 : x
2. Step 2: Convert to fraction form
   1,086.63/1,625.49 = 913.56/x
3. Step 3: Cross multiply
   1,086.63x = 1,625.49 × 913.56
4. Step 4: Simplify right side
   1,086.63x = 1,484,982.64
5. Step 5: Solve for x
   x = 1,484,982.64/1,086.63
6. Step 6: Final answer
   x = 1,366.59