Finding the Fourth Proportional to 13,123.16, 19,680.47 and 4,355.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.16 : 19,680.47 = 4,355.72 : x
2. Step 2: Convert to fraction form
   13,123.16/19,680.47 = 4,355.72/x
3. Step 3: Cross multiply
   13,123.16x = 19,680.47 × 4,355.72
4. Step 4: Simplify right side
   13,123.16x = 85,722,644.21
5. Step 5: Solve for x
   x = 85,722,644.21/13,123.16
6. Step 6: Final answer
   x = 6,532.16