Finding the Fourth Proportional to 39,156.96, 58,728.69 and 12,862.20

Step by Step Solution

1. Step 1: Write the proportion equation
   39,156.96 : 58,728.69 = 12,862.20 : x
2. Step 2: Convert to fraction form
   39,156.96/58,728.69 = 12,862.20/x
3. Step 3: Cross multiply
   39,156.96x = 58,728.69 × 12,862.20
4. Step 4: Simplify right side
   39,156.96x = 755,380,156.52
5. Step 5: Solve for x
   x = 755,380,156.52/39,156.96
6. Step 6: Final answer
   x = 19,291.08