Finding the Fourth Proportional to 3,931.30, 5,422.34 and 2,670.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.30 : 5,422.34 = 2,670.15 : x
2. Step 2: Convert to fraction form
   3,931.30/5,422.34 = 2,670.15/x
3. Step 3: Cross multiply
   3,931.30x = 5,422.34 × 2,670.15
4. Step 4: Simplify right side
   3,931.30x = 14,478,467.83
5. Step 5: Solve for x
   x = 14,478,467.83/3,931.30
6. Step 6: Final answer
   x = 3,682.87