Finding the Fourth Proportional to 79,406.61, 109,539.78 and 64,316.31

Step by Step Solution

1. Step 1: Write the proportion equation
   79,406.61 : 109,539.78 = 64,316.31 : x
2. Step 2: Convert to fraction form
   79,406.61/109,539.78 = 64,316.31/x
3. Step 3: Cross multiply
   79,406.61x = 109,539.78 × 64,316.31
4. Step 4: Simplify right side
   79,406.61x = 7,045,194,447.81
5. Step 5: Solve for x
   x = 7,045,194,447.81/79,406.61
6. Step 6: Final answer
   x = 88,723.02