Finding the Fourth Proportional to 100,204.34, 138,457.89 and 78,863.67

Step by Step Solution

1. Step 1: Write the proportion equation
   100,204.34 : 138,457.89 = 78,863.67 : x
2. Step 2: Convert to fraction form
   100,204.34/138,457.89 = 78,863.67/x
3. Step 3: Cross multiply
   100,204.34x = 138,457.89 × 78,863.67
4. Step 4: Simplify right side
   100,204.34x = 10,919,297,345.86
5. Step 5: Solve for x
   x = 10,919,297,345.86/100,204.34
6. Step 6: Final answer
   x = 108,970.31