Finding the Fourth Proportional to 71,340.30, 106,978.88 and 21,410.80

Step by Step Solution

1. Step 1: Write the proportion equation
   71,340.30 : 106,978.88 = 21,410.80 : x
2. Step 2: Convert to fraction form
   71,340.30/106,978.88 = 21,410.80/x
3. Step 3: Cross multiply
   71,340.30x = 106,978.88 × 21,410.80
4. Step 4: Simplify right side
   71,340.30x = 2,290,503,189.98
5. Step 5: Solve for x
   x = 2,290,503,189.98/71,340.30
6. Step 6: Final answer
   x = 32,106.72