Finding the Fourth Proportional to 1,191.43, 1,643.63 and 693.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.43 : 1,643.63 = 693.77 : x
2. Step 2: Convert to fraction form
   1,191.43/1,643.63 = 693.77/x
3. Step 3: Cross multiply
   1,191.43x = 1,643.63 × 693.77
4. Step 4: Simplify right side
   1,191.43x = 1,140,303.37
5. Step 5: Solve for x
   x = 1,140,303.37/1,191.43
6. Step 6: Final answer
   x = 957.09