Finding the Fourth Proportional to 86,070.72, 129,142.56 and 79,181.76

Step by Step Solution

1. Step 1: Write the proportion equation
   86,070.72 : 129,142.56 = 79,181.76 : x
2. Step 2: Convert to fraction form
   86,070.72/129,142.56 = 79,181.76/x
3. Step 3: Cross multiply
   86,070.72x = 129,142.56 × 79,181.76
4. Step 4: Simplify right side
   86,070.72x = 10,225,735,191.71
5. Step 5: Solve for x
   x = 10,225,735,191.71/86,070.72
6. Step 6: Final answer
   x = 118,806.20