Finding the Fourth Proportional to 278,690.15, 418,146.00 and 89,179.72

Step by Step Solution

1. Step 1: Write the proportion equation
   278,690.15 : 418,146.00 = 89,179.72 : x
2. Step 2: Convert to fraction form
   278,690.15/418,146.00 = 89,179.72/x
3. Step 3: Cross multiply
   278,690.15x = 418,146.00 × 89,179.72
4. Step 4: Simplify right side
   278,690.15x = 37,290,140,662.49
5. Step 5: Solve for x
   x = 37,290,140,662.49/278,690.15
6. Step 6: Final answer
   x = 133,805.02