Finding the Fourth Proportional to 1,112.17, 1,667.25 and 526.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.17 : 1,667.25 = 526.80 : x
2. Step 2: Convert to fraction form
   1,112.17/1,667.25 = 526.80/x
3. Step 3: Cross multiply
   1,112.17x = 1,667.25 × 526.80
4. Step 4: Simplify right side
   1,112.17x = 878,311.33
5. Step 5: Solve for x
   x = 878,311.33/1,112.17
6. Step 6: Final answer
   x = 789.73