Finding the Fourth Proportional to 129,145.89, 178,256.52 and 83,821.23

Step by Step Solution

1. Step 1: Write the proportion equation
   129,145.89 : 178,256.52 = 83,821.23 : x
2. Step 2: Convert to fraction form
   129,145.89/178,256.52 = 83,821.23/x
3. Step 3: Cross multiply
   129,145.89x = 178,256.52 × 83,821.23
4. Step 4: Simplify right side
   129,145.89x = 14,941,680,761.92
5. Step 5: Solve for x
   x = 14,941,680,761.92/129,145.89
6. Step 6: Final answer
   x = 115,696.14