Finding the Fourth Proportional to 93,388.20, 139,176.50 and 90,399.48

Step by Step Solution

1. Step 1: Write the proportion equation
   93,388.20 : 139,176.50 = 90,399.48 : x
2. Step 2: Convert to fraction form
   93,388.20/139,176.50 = 90,399.48/x
3. Step 3: Cross multiply
   93,388.20x = 139,176.50 × 90,399.48
4. Step 4: Simplify right side
   93,388.20x = 12,581,483,228.22
5. Step 5: Solve for x
   x = 12,581,483,228.22/93,388.20
6. Step 6: Final answer
   x = 134,722.41