Finding the Fourth Proportional to 1,379.79, 1,906.74 and 1,131.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.79 : 1,906.74 = 1,131.03 : x
2. Step 2: Convert to fraction form
   1,379.79/1,906.74 = 1,131.03/x
3. Step 3: Cross multiply
   1,379.79x = 1,906.74 × 1,131.03
4. Step 4: Simplify right side
   1,379.79x = 2,156,580.14
5. Step 5: Solve for x
   x = 2,156,580.14/1,379.79
6. Step 6: Final answer
   x = 1,562.98