Finding the Fourth Proportional to 1,868.94, 2,801.78 and 715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.94 : 2,801.78 = 715.50 : x
2. Step 2: Convert to fraction form
   1,868.94/2,801.78 = 715.50/x
3. Step 3: Cross multiply
   1,868.94x = 2,801.78 × 715.50
4. Step 4: Simplify right side
   1,868.94x = 2,004,673.59
5. Step 5: Solve for x
   x = 2,004,673.59/1,868.94
6. Step 6: Final answer
   x = 1,072.63