Finding the Fourth Proportional to 2,123.32, 2,930.18 and 1,239.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.32 : 2,930.18 = 1,239.72 : x
2. Step 2: Convert to fraction form
   2,123.32/2,930.18 = 1,239.72/x
3. Step 3: Cross multiply
   2,123.32x = 2,930.18 × 1,239.72
4. Step 4: Simplify right side
   2,123.32x = 3,632,602.75
5. Step 5: Solve for x
   x = 3,632,602.75/2,123.32
6. Step 6: Final answer
   x = 1,710.81