Finding the Fourth Proportional to 78,111.98, 117,168.06 and 18,947.75

Step by Step Solution

1. Step 1: Write the proportion equation
   78,111.98 : 117,168.06 = 18,947.75 : x
2. Step 2: Convert to fraction form
   78,111.98/117,168.06 = 18,947.75/x
3. Step 3: Cross multiply
   78,111.98x = 117,168.06 × 18,947.75
4. Step 4: Simplify right side
   78,111.98x = 2,220,070,523.02
5. Step 5: Solve for x
   x = 2,220,070,523.02/78,111.98
6. Step 6: Final answer
   x = 28,421.64