Finding the Fourth Proportional to 1,242, 1,711.80 and 1,111.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242 : 1,711.80 = 1,111.32 : x
2. Step 2: Convert to fraction form
   1,242/1,711.80 = 1,111.32/x
3. Step 3: Cross multiply
   1,242x = 1,711.80 × 1,111.32
4. Step 4: Simplify right side
   1,242x = 1,902,357.58
5. Step 5: Solve for x
   x = 1,902,357.58/1,242
6. Step 6: Final answer
   x = 1,531.69