Finding the Fourth Proportional to 1,139.37, 1,715.28 and 776.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.37 : 1,715.28 = 776.46 : x
2. Step 2: Convert to fraction form
   1,139.37/1,715.28 = 776.46/x
3. Step 3: Cross multiply
   1,139.37x = 1,715.28 × 776.46
4. Step 4: Simplify right side
   1,139.37x = 1,331,845.01
5. Step 5: Solve for x
   x = 1,331,845.01/1,139.37
6. Step 6: Final answer
   x = 1,168.93