Finding the Fourth Proportional to 89,612.80, 134,123.92 and 79,771.30

Step by Step Solution

1. Step 1: Write the proportion equation
   89,612.80 : 134,123.92 = 79,771.30 : x
2. Step 2: Convert to fraction form
   89,612.80/134,123.92 = 79,771.30/x
3. Step 3: Cross multiply
   89,612.80x = 134,123.92 × 79,771.30
4. Step 4: Simplify right side
   89,612.80x = 10,699,238,924.76
5. Step 5: Solve for x
   x = 10,699,238,924.76/89,612.80
6. Step 6: Final answer
   x = 119,394.10