Finding the Fourth Proportional to 79,209.07, 109,405.61 and 64,118.77

Step by Step Solution

1. Step 1: Write the proportion equation
   79,209.07 : 109,405.61 = 64,118.77 : x
2. Step 2: Convert to fraction form
   79,209.07/109,405.61 = 64,118.77/x
3. Step 3: Cross multiply
   79,209.07x = 109,405.61 × 64,118.77
4. Step 4: Simplify right side
   79,209.07x = 7,014,953,144.30
5. Step 5: Solve for x
   x = 7,014,953,144.30/79,209.07
6. Step 6: Final answer
   x = 88,562.50