Finding the Fourth Proportional to 72,801.36, 109,215.82 and 28,425.30

Step by Step Solution

1. Step 1: Write the proportion equation
   72,801.36 : 109,215.82 = 28,425.30 : x
2. Step 2: Convert to fraction form
   72,801.36/109,215.82 = 28,425.30/x
3. Step 3: Cross multiply
   72,801.36x = 109,215.82 × 28,425.30
4. Step 4: Simplify right side
   72,801.36x = 3,104,492,915.78
5. Step 5: Solve for x
   x = 3,104,492,915.78/72,801.36
6. Step 6: Final answer
   x = 42,643.34