Finding the Fourth Proportional to 39,216.86, 58,826.05 and 12,921.83

Step by Step Solution

1. Step 1: Write the proportion equation
   39,216.86 : 58,826.05 = 12,921.83 : x
2. Step 2: Convert to fraction form
   39,216.86/58,826.05 = 12,921.83/x
3. Step 3: Cross multiply
   39,216.86x = 58,826.05 × 12,921.83
4. Step 4: Simplify right side
   39,216.86x = 760,140,111.83
5. Step 5: Solve for x
   x = 760,140,111.83/39,216.86
6. Step 6: Final answer
   x = 19,382.99