Finding the Fourth Proportional to 78,028.72, 117,049.83 and 21,869.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,028.72 : 117,049.83 = 21,869.80 : x
2. Step 2: Convert to fraction form
   78,028.72/117,049.83 = 21,869.80/x
3. Step 3: Cross multiply
   78,028.72x = 117,049.83 × 21,869.80
4. Step 4: Simplify right side
   78,028.72x = 2,559,856,372.13
5. Step 5: Solve for x
   x = 2,559,856,372.13/78,028.72
6. Step 6: Final answer
   x = 32,806.59