Finding the Fourth Proportional to 78,064.18, 117,096.56 and 18,899.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78,064.18 : 117,096.56 = 18,899.76 : x
2. Step 2: Convert to fraction form
   78,064.18/117,096.56 = 18,899.76/x
3. Step 3: Cross multiply
   78,064.18x = 117,096.56 × 18,899.76
4. Step 4: Simplify right side
   78,064.18x = 2,213,096,880.83
5. Step 5: Solve for x
   x = 2,213,096,880.83/78,064.18
6. Step 6: Final answer
   x = 28,349.71