Finding the Fourth Proportional to 1,522.78, 2,101.56 and 859.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.78 : 2,101.56 = 859.76 : x
2. Step 2: Convert to fraction form
   1,522.78/2,101.56 = 859.76/x
3. Step 3: Cross multiply
   1,522.78x = 2,101.56 × 859.76
4. Step 4: Simplify right side
   1,522.78x = 1,806,837.23
5. Step 5: Solve for x
   x = 1,806,837.23/1,522.78
6. Step 6: Final answer
   x = 1,186.54