Finding the Fourth Proportional to 102,939.38, 142,145 and 64,762.56

Step by Step Solution

1. Step 1: Write the proportion equation
   102,939.38 : 142,145 = 64,762.56 : x
2. Step 2: Convert to fraction form
   102,939.38/142,145 = 64,762.56/x
3. Step 3: Cross multiply
   102,939.38x = 142,145 × 64,762.56
4. Step 4: Simplify right side
   102,939.38x = 9,205,674,091.20
5. Step 5: Solve for x
   x = 9,205,674,091.20/102,939.38
6. Step 6: Final answer
   x = 89,428.11