Finding the Fourth Proportional to 91,587.92, 137,401.60 and 28,406.80

Step by Step Solution

1. Step 1: Write the proportion equation
   91,587.92 : 137,401.60 = 28,406.80 : x
2. Step 2: Convert to fraction form
   91,587.92/137,401.60 = 28,406.80/x
3. Step 3: Cross multiply
   91,587.92x = 137,401.60 × 28,406.80
4. Step 4: Simplify right side
   91,587.92x = 3,903,139,770.88
5. Step 5: Solve for x
   x = 3,903,139,770.88/91,587.92
6. Step 6: Final answer
   x = 42,616.32