Finding the Fourth Proportional to 1,308.76, 1,962.72 and 528.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.76 : 1,962.72 = 528.57 : x
2. Step 2: Convert to fraction form
   1,308.76/1,962.72 = 528.57/x
3. Step 3: Cross multiply
   1,308.76x = 1,962.72 × 528.57
4. Step 4: Simplify right side
   1,308.76x = 1,037,434.91
5. Step 5: Solve for x
   x = 1,037,434.91/1,308.76
6. Step 6: Final answer
   x = 792.69