Finding the Fourth Proportional to 78,091.84, 117,136.72 and 18,928.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78,091.84 : 117,136.72 = 18,928.02 : x
2. Step 2: Convert to fraction form
   78,091.84/117,136.72 = 18,928.02/x
3. Step 3: Cross multiply
   78,091.84x = 117,136.72 × 18,928.02
4. Step 4: Simplify right side
   78,091.84x = 2,217,166,641.82
5. Step 5: Solve for x
   x = 2,217,166,641.82/78,091.84
6. Step 6: Final answer
   x = 28,391.78