Finding the Fourth Proportional to 1,526.78, 2,106.72 and 863.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,526.78 : 2,106.72 = 863.60 : x
2. Step 2: Convert to fraction form
   1,526.78/2,106.72 = 863.60/x
3. Step 3: Cross multiply
   1,526.78x = 2,106.72 × 863.60
4. Step 4: Simplify right side
   1,526.78x = 1,819,363.39
5. Step 5: Solve for x
   x = 1,819,363.39/1,526.78
6. Step 6: Final answer
   x = 1,191.63