Finding the Fourth Proportional to 2,715.39, 4,072.28 and 767.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.39 : 4,072.28 = 767.07 : x
2. Step 2: Convert to fraction form
   2,715.39/4,072.28 = 767.07/x
3. Step 3: Cross multiply
   2,715.39x = 4,072.28 × 767.07
4. Step 4: Simplify right side
   2,715.39x = 3,123,719.98
5. Step 5: Solve for x
   x = 3,123,719.98/2,715.39
6. Step 6: Final answer
   x = 1,150.38