Finding the Fourth Proportional to 89,066.20, 133,340.10 and 78,698.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,066.20 : 133,340.10 = 78,698.20 : x
2. Step 2: Convert to fraction form
   89,066.20/133,340.10 = 78,698.20/x
3. Step 3: Cross multiply
   89,066.20x = 133,340.10 × 78,698.20
4. Step 4: Simplify right side
   89,066.20x = 10,493,625,857.82
5. Step 5: Solve for x
   x = 10,493,625,857.82/89,066.20
6. Step 6: Final answer
   x = 117,818.27