Finding the Fourth Proportional to 1,146.89, 1,719.73 and 781.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.89 : 1,719.73 = 781.79 : x
2. Step 2: Convert to fraction form
   1,146.89/1,719.73 = 781.79/x
3. Step 3: Cross multiply
   1,146.89x = 1,719.73 × 781.79
4. Step 4: Simplify right side
   1,146.89x = 1,344,460.10
5. Step 5: Solve for x
   x = 1,344,460.10/1,146.89
6. Step 6: Final answer
   x = 1,172.26