Finding the Fourth Proportional to 289,353.63, 433,871.89 and 89,618.57

Step by Step Solution

1. Step 1: Write the proportion equation
   289,353.63 : 433,871.89 = 89,618.57 : x
2. Step 2: Convert to fraction form
   289,353.63/433,871.89 = 89,618.57/x
3. Step 3: Cross multiply
   289,353.63x = 433,871.89 × 89,618.57
4. Step 4: Simplify right side
   289,353.63x = 38,882,978,082.72
5. Step 5: Solve for x
   x = 38,882,978,082.72/289,353.63
6. Step 6: Final answer
   x = 134,378.74