Finding the Fourth Proportional to 2,123.12, 2,929.80 and 1,191.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.12 : 2,929.80 = 1,191.92 : x
2. Step 2: Convert to fraction form
   2,123.12/2,929.80 = 1,191.92/x
3. Step 3: Cross multiply
   2,123.12x = 2,929.80 × 1,191.92
4. Step 4: Simplify right side
   2,123.12x = 3,492,087.22
5. Step 5: Solve for x
   x = 3,492,087.22/2,123.12
6. Step 6: Final answer
   x = 1,644.79