Finding the Fourth Proportional to 1,191.17, 1,643.36 and 693.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.17 : 1,643.36 = 693.72 : x
2. Step 2: Convert to fraction form
   1,191.17/1,643.36 = 693.72/x
3. Step 3: Cross multiply
   1,191.17x = 1,643.36 × 693.72
4. Step 4: Simplify right side
   1,191.17x = 1,140,028.23
5. Step 5: Solve for x
   x = 1,140,028.23/1,191.17
6. Step 6: Final answer
   x = 957.07