Finding the Fourth Proportional to 78,892.61, 118,338.89 and 19,728.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78,892.61 : 118,338.89 = 19,728.27 : x
2. Step 2: Convert to fraction form
   78,892.61/118,338.89 = 19,728.27/x
3. Step 3: Cross multiply
   78,892.61x = 118,338.89 × 19,728.27
4. Step 4: Simplify right side
   78,892.61x = 2,334,621,474.78
5. Step 5: Solve for x
   x = 2,334,621,474.78/78,892.61
6. Step 6: Final answer
   x = 29,592.40