Finding the Fourth Proportional to 2,700.60, 3,730.86 and 2,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,700.60 : 3,730.86 = 2,139.30 : x
2. Step 2: Convert to fraction form
   2,700.60/3,730.86 = 2,139.30/x
3. Step 3: Cross multiply
   2,700.60x = 3,730.86 × 2,139.30
4. Step 4: Simplify right side
   2,700.60x = 7,981,428.80
5. Step 5: Solve for x
   x = 7,981,428.80/2,700.60
6. Step 6: Final answer
   x = 2,955.43