Finding the Fourth Proportional to 68,400.72, 102,535.50 and 21,620.82

Step by Step Solution

1. Step 1: Write the proportion equation
   68,400.72 : 102,535.50 = 21,620.82 : x
2. Step 2: Convert to fraction form
   68,400.72/102,535.50 = 21,620.82/x
3. Step 3: Cross multiply
   68,400.72x = 102,535.50 × 21,620.82
4. Step 4: Simplify right side
   68,400.72x = 2,216,901,589.11
5. Step 5: Solve for x
   x = 2,216,901,589.11/68,400.72
6. Step 6: Final answer
   x = 32,410.50