Finding the Fourth Proportional to 1,074.16, 1,608.72 and 707.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.16 : 1,608.72 = 707.89 : x
2. Step 2: Convert to fraction form
   1,074.16/1,608.72 = 707.89/x
3. Step 3: Cross multiply
   1,074.16x = 1,608.72 × 707.89
4. Step 4: Simplify right side
   1,074.16x = 1,138,796.80
5. Step 5: Solve for x
   x = 1,138,796.80/1,074.16
6. Step 6: Final answer
   x = 1,060.17