Finding the Fourth Proportional to 103,678.30, 155,287.05 and 89,854.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,678.30 : 155,287.05 = 89,854.30 : x
2. Step 2: Convert to fraction form
   103,678.30/155,287.05 = 89,854.30/x
3. Step 3: Cross multiply
   103,678.30x = 155,287.05 × 89,854.30
4. Step 4: Simplify right side
   103,678.30x = 13,953,209,176.82
5. Step 5: Solve for x
   x = 13,953,209,176.82/103,678.30
6. Step 6: Final answer
   x = 134,581.77