Finding the Fourth Proportional to 1,259.69, 1,887.60 and 528.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.69 : 1,887.60 = 528.86 : x
2. Step 2: Convert to fraction form
   1,259.69/1,887.60 = 528.86/x
3. Step 3: Cross multiply
   1,259.69x = 1,887.60 × 528.86
4. Step 4: Simplify right side
   1,259.69x = 998,282.18
5. Step 5: Solve for x
   x = 998,282.18/1,259.69
6. Step 6: Final answer
   x = 792.49