Finding the Fourth Proportional to 1,188.59, 1,783.43 and 611.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188.59 : 1,783.43 = 611.87 : x
2. Step 2: Convert to fraction form
   1,188.59/1,783.43 = 611.87/x
3. Step 3: Cross multiply
   1,188.59x = 1,783.43 × 611.87
4. Step 4: Simplify right side
   1,188.59x = 1,091,231.01
5. Step 5: Solve for x
   x = 1,091,231.01/1,188.59
6. Step 6: Final answer
   x = 918.09