Finding the Fourth Proportional to 85,222.36, 117,819.42 and 63,964.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,222.36 : 117,819.42 = 63,964.72 : x
2. Step 2: Convert to fraction form
   85,222.36/117,819.42 = 63,964.72/x
3. Step 3: Cross multiply
   85,222.36x = 117,819.42 × 63,964.72
4. Step 4: Simplify right side
   85,222.36x = 7,536,286,210.86
5. Step 5: Solve for x
   x = 7,536,286,210.86/85,222.36
6. Step 6: Final answer
   x = 88,430.86