Finding the Fourth Proportional to 109,916.12, 164,818.74 and 78,308.12

Step by Step Solution

1. Step 1: Write the proportion equation
   109,916.12 : 164,818.74 = 78,308.12 : x
2. Step 2: Convert to fraction form
   109,916.12/164,818.74 = 78,308.12/x
3. Step 3: Cross multiply
   109,916.12x = 164,818.74 × 78,308.12
4. Step 4: Simplify right side
   109,916.12x = 12,906,645,670.17
5. Step 5: Solve for x
   x = 12,906,645,670.17/109,916.12
6. Step 6: Final answer
   x = 117,422.68