Finding the Fourth Proportional to 1,190.89, 1,643.53 and 693.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,190.89 : 1,643.53 = 693.58 : x
2. Step 2: Convert to fraction form
   1,190.89/1,643.53 = 693.58/x
3. Step 3: Cross multiply
   1,190.89x = 1,643.53 × 693.58
4. Step 4: Simplify right side
   1,190.89x = 1,139,911.32
5. Step 5: Solve for x
   x = 1,139,911.32/1,190.89
6. Step 6: Final answer
   x = 957.19