Finding the Fourth Proportional to 143,613.50, 198,057.60 and 89,903.40

Step by Step Solution

1. Step 1: Write the proportion equation
   143,613.50 : 198,057.60 = 89,903.40 : x
2. Step 2: Convert to fraction form
   143,613.50/198,057.60 = 89,903.40/x
3. Step 3: Cross multiply
   143,613.50x = 198,057.60 × 89,903.40
4. Step 4: Simplify right side
   143,613.50x = 17,806,051,635.84
5. Step 5: Solve for x
   x = 17,806,051,635.84/143,613.50
6. Step 6: Final answer
   x = 123,985.92