Finding the Fourth Proportional to 21,978.12, 32,970.42 and 6,393.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.12 : 32,970.42 = 6,393.72 : x
2. Step 2: Convert to fraction form
   21,978.12/32,970.42 = 6,393.72/x
3. Step 3: Cross multiply
   21,978.12x = 32,970.42 × 6,393.72
4. Step 4: Simplify right side
   21,978.12x = 210,803,633.76
5. Step 5: Solve for x
   x = 210,803,633.76/21,978.12
6. Step 6: Final answer
   x = 9,591.52