Finding the Fourth Proportional to 78,128.50, 117,192.78 and 21,974.58

Step by Step Solution

1. Step 1: Write the proportion equation
   78,128.50 : 117,192.78 = 21,974.58 : x
2. Step 2: Convert to fraction form
   78,128.50/117,192.78 = 21,974.58/x
3. Step 3: Cross multiply
   78,128.50x = 117,192.78 × 21,974.58
4. Step 4: Simplify right side
   78,128.50x = 2,575,262,119.53
5. Step 5: Solve for x
   x = 2,575,262,119.53/78,128.50
6. Step 6: Final answer
   x = 32,961.88