Finding the Fourth Proportional to 21,510.78, 32,272.31 and 6,719.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,510.78 : 32,272.31 = 6,719.91 : x
2. Step 2: Convert to fraction form
   21,510.78/32,272.31 = 6,719.91/x
3. Step 3: Cross multiply
   21,510.78x = 32,272.31 × 6,719.91
4. Step 4: Simplify right side
   21,510.78x = 216,867,018.69
5. Step 5: Solve for x
   x = 216,867,018.69/21,510.78
6. Step 6: Final answer
   x = 10,081.78