Finding the Fourth Proportional to 89,609.19, 123,393.75 and 87,620.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89,609.19 : 123,393.75 = 87,620.18 : x
2. Step 2: Convert to fraction form
   89,609.19/123,393.75 = 87,620.18/x
3. Step 3: Cross multiply
   89,609.19x = 123,393.75 × 87,620.18
4. Step 4: Simplify right side
   89,609.19x = 10,811,781,968.91
5. Step 5: Solve for x
   x = 10,811,781,968.91/89,609.19
6. Step 6: Final answer
   x = 120,654.83