Finding the Fourth Proportional to 109,916.62, 164,819.49 and 78,308.62

Step by Step Solution

1. Step 1: Write the proportion equation
   109,916.62 : 164,819.49 = 78,308.62 : x
2. Step 2: Convert to fraction form
   109,916.62/164,819.49 = 78,308.62/x
3. Step 3: Cross multiply
   109,916.62x = 164,819.49 × 78,308.62
4. Step 4: Simplify right side
   109,916.62x = 12,906,786,811.00
5. Step 5: Solve for x
   x = 12,906,786,811.00/109,916.62
6. Step 6: Final answer
   x = 117,423.43