Finding the Fourth Proportional to 2,123.84, 3,187.20 and 970.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.84 : 3,187.20 = 970.40 : x
2. Step 2: Convert to fraction form
   2,123.84/3,187.20 = 970.40/x
3. Step 3: Cross multiply
   2,123.84x = 3,187.20 × 970.40
4. Step 4: Simplify right side
   2,123.84x = 3,092,858.88
5. Step 5: Solve for x
   x = 3,092,858.88/2,123.84
6. Step 6: Final answer
   x = 1,456.26