Finding the Fourth Proportional to 108,978.54, 150,457.47 and 86,408.70

Step by Step Solution

1. Step 1: Write the proportion equation
   108,978.54 : 150,457.47 = 86,408.70 : x
2. Step 2: Convert to fraction form
   108,978.54/150,457.47 = 86,408.70/x
3. Step 3: Cross multiply
   108,978.54x = 150,457.47 × 86,408.70
4. Step 4: Simplify right side
   108,978.54x = 13,000,834,387.99
5. Step 5: Solve for x
   x = 13,000,834,387.99/108,978.54
6. Step 6: Final answer
   x = 119,297.20