Finding the Fourth Proportional to 3,100.88, 4,279.64 and 2,156.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.88 : 4,279.64 = 2,156.15 : x
2. Step 2: Convert to fraction form
   3,100.88/4,279.64 = 2,156.15/x
3. Step 3: Cross multiply
   3,100.88x = 4,279.64 × 2,156.15
4. Step 4: Simplify right side
   3,100.88x = 9,227,513.61
5. Step 5: Solve for x
   x = 9,227,513.61/3,100.88
6. Step 6: Final answer
   x = 2,975.78