Finding the Fourth Proportional to 86,946.72, 129,689.28 and 78,973.92

Step by Step Solution

1. Step 1: Write the proportion equation
   86,946.72 : 129,689.28 = 78,973.92 : x
2. Step 2: Convert to fraction form
   86,946.72/129,689.28 = 78,973.92/x
3. Step 3: Cross multiply
   86,946.72x = 129,689.28 × 78,973.92
4. Step 4: Simplify right side
   86,946.72x = 10,242,070,823.58
5. Step 5: Solve for x
   x = 10,242,070,823.58/86,946.72
6. Step 6: Final answer
   x = 117,797.09