Finding the Fourth Proportional to 1,173.50, 1,619.46 and 707.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.50 : 1,619.46 = 707.78 : x
2. Step 2: Convert to fraction form
   1,173.50/1,619.46 = 707.78/x
3. Step 3: Cross multiply
   1,173.50x = 1,619.46 × 707.78
4. Step 4: Simplify right side
   1,173.50x = 1,146,221.40
5. Step 5: Solve for x
   x = 1,146,221.40/1,173.50
6. Step 6: Final answer
   x = 976.75