Finding the Fourth Proportional to 120,105.58, 165,742.78 and 66,389.22

Step by Step Solution

1. Step 1: Write the proportion equation
   120,105.58 : 165,742.78 = 66,389.22 : x
2. Step 2: Convert to fraction form
   120,105.58/165,742.78 = 66,389.22/x
3. Step 3: Cross multiply
   120,105.58x = 165,742.78 × 66,389.22
4. Step 4: Simplify right side
   120,105.58x = 11,003,533,884.83
5. Step 5: Solve for x
   x = 11,003,533,884.83/120,105.58
6. Step 6: Final answer
   x = 91,615.51