Finding the Fourth Proportional to 2,123.78, 2,931.06 and 1,192.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.78 : 2,931.06 = 1,192.46 : x
2. Step 2: Convert to fraction form
   2,123.78/2,931.06 = 1,192.46/x
3. Step 3: Cross multiply
   2,123.78x = 2,931.06 × 1,192.46
4. Step 4: Simplify right side
   2,123.78x = 3,495,171.81
5. Step 5: Solve for x
   x = 3,495,171.81/2,123.78
6. Step 6: Final answer
   x = 1,645.73