Finding the Fourth Proportional to 143,089.13, 197,463.78 and 89,405.30

Step by Step Solution

1. Step 1: Write the proportion equation
   143,089.13 : 197,463.78 = 89,405.30 : x
2. Step 2: Convert to fraction form
   143,089.13/197,463.78 = 89,405.30/x
3. Step 3: Cross multiply
   143,089.13x = 197,463.78 × 89,405.30
4. Step 4: Simplify right side
   143,089.13x = 17,654,308,490.03
5. Step 5: Solve for x
   x = 17,654,308,490.03/143,089.13
6. Step 6: Final answer
   x = 123,379.80