Finding the Fourth Proportional to 1,105.39, 1,656.58 and 611.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.39 : 1,656.58 = 611.07 : x
2. Step 2: Convert to fraction form
   1,105.39/1,656.58 = 611.07/x
3. Step 3: Cross multiply
   1,105.39x = 1,656.58 × 611.07
4. Step 4: Simplify right side
   1,105.39x = 1,012,276.42
5. Step 5: Solve for x
   x = 1,012,276.42/1,105.39
6. Step 6: Final answer
   x = 915.76