Finding the Fourth Proportional to 91,909.28, 137,241.34 and 72,976.88

Step by Step Solution

1. Step 1: Write the proportion equation
   91,909.28 : 137,241.34 = 72,976.88 : x
2. Step 2: Convert to fraction form
   91,909.28/137,241.34 = 72,976.88/x
3. Step 3: Cross multiply
   91,909.28x = 137,241.34 × 72,976.88
4. Step 4: Simplify right side
   91,909.28x = 10,015,444,800.22
5. Step 5: Solve for x
   x = 10,015,444,800.22/91,909.28
6. Step 6: Final answer
   x = 108,970.99