Finding the Fourth Proportional to 103,644.30, 155,236.05 and 89,820.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,644.30 : 155,236.05 = 89,820.30 : x
2. Step 2: Convert to fraction form
   103,644.30/155,236.05 = 89,820.30/x
3. Step 3: Cross multiply
   103,644.30x = 155,236.05 × 89,820.30
4. Step 4: Simplify right side
   103,644.30x = 13,943,348,581.82
5. Step 5: Solve for x
   x = 13,943,348,581.82/103,644.30
6. Step 6: Final answer
   x = 134,530.78