Finding the Fourth Proportional to 39,064.56, 58,583.40 and 12,762.78

Step by Step Solution

1. Step 1: Write the proportion equation
   39,064.56 : 58,583.40 = 12,762.78 : x
2. Step 2: Convert to fraction form
   39,064.56/58,583.40 = 12,762.78/x
3. Step 3: Cross multiply
   39,064.56x = 58,583.40 × 12,762.78
4. Step 4: Simplify right side
   39,064.56x = 747,687,045.85
5. Step 5: Solve for x
   x = 747,687,045.85/39,064.56
6. Step 6: Final answer
   x = 19,139.78