Finding the Fourth Proportional to 2,479.34, 3,421.47 and 1,431.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.34 : 3,421.47 = 1,431.98 : x
2. Step 2: Convert to fraction form
   2,479.34/3,421.47 = 1,431.98/x
3. Step 3: Cross multiply
   2,479.34x = 3,421.47 × 1,431.98
4. Step 4: Simplify right side
   2,479.34x = 4,899,476.61
5. Step 5: Solve for x
   x = 4,899,476.61/2,479.34
6. Step 6: Final answer
   x = 1,976.12