Finding the Fourth Proportional to 79,210.57, 109,407.69 and 64,120.27

Step by Step Solution

1. Step 1: Write the proportion equation
   79,210.57 : 109,407.69 = 64,120.27 : x
2. Step 2: Convert to fraction form
   79,210.57/109,407.69 = 64,120.27/x
3. Step 3: Cross multiply
   79,210.57x = 109,407.69 × 64,120.27
4. Step 4: Simplify right side
   79,210.57x = 7,015,250,622.88
5. Step 5: Solve for x
   x = 7,015,250,622.88/79,210.57
6. Step 6: Final answer
   x = 88,564.58