Finding the Fourth Proportional to 28,633.94, 42,915.59 and 20,763.47

Step by Step Solution

1. Step 1: Write the proportion equation
   28,633.94 : 42,915.59 = 20,763.47 : x
2. Step 2: Convert to fraction form
   28,633.94/42,915.59 = 20,763.47/x
3. Step 3: Cross multiply
   28,633.94x = 42,915.59 × 20,763.47
4. Step 4: Simplify right side
   28,633.94x = 891,076,247.10
5. Step 5: Solve for x
   x = 891,076,247.10/28,633.94
6. Step 6: Final answer
   x = 31,119.59