Finding the Fourth Proportional to 1,144.62, 1,715.76 and 528.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.62 : 1,715.76 = 528.78 : x
2. Step 2: Convert to fraction form
   1,144.62/1,715.76 = 528.78/x
3. Step 3: Cross multiply
   1,144.62x = 1,715.76 × 528.78
4. Step 4: Simplify right side
   1,144.62x = 907,259.57
5. Step 5: Solve for x
   x = 907,259.57/1,144.62
6. Step 6: Final answer
   x = 792.63