Finding the Fourth Proportional to 1,191.10, 1,643.50 and 693.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.10 : 1,643.50 = 693.56 : x
2. Step 2: Convert to fraction form
   1,191.10/1,643.50 = 693.56/x
3. Step 3: Cross multiply
   1,191.10x = 1,643.50 × 693.56
4. Step 4: Simplify right side
   1,191.10x = 1,139,865.86
5. Step 5: Solve for x
   x = 1,139,865.86/1,191.10
6. Step 6: Final answer
   x = 956.99