Finding the Fourth Proportional to 39,078.55, 58,623.29 and 12,778.05

Step by Step Solution

1. Step 1: Write the proportion equation
   39,078.55 : 58,623.29 = 12,778.05 : x
2. Step 2: Convert to fraction form
   39,078.55/58,623.29 = 12,778.05/x
3. Step 3: Cross multiply
   39,078.55x = 58,623.29 × 12,778.05
4. Step 4: Simplify right side
   39,078.55x = 749,091,266.89
5. Step 5: Solve for x
   x = 749,091,266.89/39,078.55
6. Step 6: Final answer
   x = 19,168.86