Finding the Fourth Proportional to 91,609.81, 126,421.61 and 55,799.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91,609.81 : 126,421.61 = 55,799.89 : x
2. Step 2: Convert to fraction form
   91,609.81/126,421.61 = 55,799.89/x
3. Step 3: Cross multiply
   91,609.81x = 126,421.61 × 55,799.89
4. Step 4: Simplify right side
   91,609.81x = 7,054,311,931.62
5. Step 5: Solve for x
   x = 7,054,311,931.62/91,609.81
6. Step 6: Final answer
   x = 77,003.89