Finding the Fourth Proportional to 89,931.56, 124,120.56 and 85,945.64

Step by Step Solution

1. Step 1: Write the proportion equation
   89,931.56 : 124,120.56 = 85,945.64 : x
2. Step 2: Convert to fraction form
   89,931.56/124,120.56 = 85,945.64/x
3. Step 3: Cross multiply
   89,931.56x = 124,120.56 × 85,945.64
4. Step 4: Simplify right side
   89,931.56x = 10,667,620,966.36
5. Step 5: Solve for x
   x = 10,667,620,966.36/89,931.56
6. Step 6: Final answer
   x = 118,619.33