Finding the Fourth Proportional to 1,112.34, 1,666.02 and 786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.34 : 1,666.02 = 786.72 : x
2. Step 2: Convert to fraction form
   1,112.34/1,666.02 = 786.72/x
3. Step 3: Cross multiply
   1,112.34x = 1,666.02 × 786.72
4. Step 4: Simplify right side
   1,112.34x = 1,310,691.25
5. Step 5: Solve for x
   x = 1,310,691.25/1,112.34
6. Step 6: Final answer
   x = 1,178.32