Finding the Fourth Proportional to 67,915.28, 101,878.54 and 21,168.16

Step by Step Solution

1. Step 1: Write the proportion equation
   67,915.28 : 101,878.54 = 21,168.16 : x
2. Step 2: Convert to fraction form
   67,915.28/101,878.54 = 21,168.16/x
3. Step 3: Cross multiply
   67,915.28x = 101,878.54 × 21,168.16
4. Step 4: Simplify right side
   67,915.28x = 2,156,581,235.29
5. Step 5: Solve for x
   x = 2,156,581,235.29/67,915.28
6. Step 6: Final answer
   x = 31,753.99