Finding the Fourth Proportional to 1,379.16, 1,903.74 and 913.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.16 : 1,903.74 = 913.56 : x
2. Step 2: Convert to fraction form
   1,379.16/1,903.74 = 913.56/x
3. Step 3: Cross multiply
   1,379.16x = 1,903.74 × 913.56
4. Step 4: Simplify right side
   1,379.16x = 1,739,180.71
5. Step 5: Solve for x
   x = 1,739,180.71/1,379.16
6. Step 6: Final answer
   x = 1,261.04