Finding the Fourth Proportional to 2,130.15, 2,940.16 and 1,908.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.15 : 2,940.16 = 1,908.72 : x
2. Step 2: Convert to fraction form
   2,130.15/2,940.16 = 1,908.72/x
3. Step 3: Cross multiply
   2,130.15x = 2,940.16 × 1,908.72
4. Step 4: Simplify right side
   2,130.15x = 5,611,937.42
5. Step 5: Solve for x
   x = 5,611,937.42/2,130.15
6. Step 6: Final answer
   x = 2,634.53