Finding the Fourth Proportional to 115,291.68, 159,100.56 and 64,990.56

Step by Step Solution

1. Step 1: Write the proportion equation
   115,291.68 : 159,100.56 = 64,990.56 : x
2. Step 2: Convert to fraction form
   115,291.68/159,100.56 = 64,990.56/x
3. Step 3: Cross multiply
   115,291.68x = 159,100.56 × 64,990.56
4. Step 4: Simplify right side
   115,291.68x = 10,340,034,490.71
5. Step 5: Solve for x
   x = 10,340,034,490.71/115,291.68
6. Step 6: Final answer
   x = 89,685.87