Finding the Fourth Proportional to 102,940.38, 142,146.38 and 64,763.56

Step by Step Solution

1. Step 1: Write the proportion equation
   102,940.38 : 142,146.38 = 64,763.56 : x
2. Step 2: Convert to fraction form
   102,940.38/142,146.38 = 64,763.56/x
3. Step 3: Cross multiply
   102,940.38x = 142,146.38 × 64,763.56
4. Step 4: Simplify right side
   102,940.38x = 9,205,905,609.91
5. Step 5: Solve for x
   x = 9,205,905,609.91/102,940.38
6. Step 6: Final answer
   x = 89,429.49