Finding the Fourth Proportional to 1,445.94, 1,990.32 and 1,279.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.94 : 1,990.32 = 1,279.86 : x
2. Step 2: Convert to fraction form
   1,445.94/1,990.32 = 1,279.86/x
3. Step 3: Cross multiply
   1,445.94x = 1,990.32 × 1,279.86
4. Step 4: Simplify right side
   1,445.94x = 2,547,330.96
5. Step 5: Solve for x
   x = 2,547,330.96/1,445.94
6. Step 6: Final answer
   x = 1,761.71