Finding the Fourth Proportional to 39,300.66, 58,929.12 and 12,998.34

Step by Step Solution

1. Step 1: Write the proportion equation
   39,300.66 : 58,929.12 = 12,998.34 : x
2. Step 2: Convert to fraction form
   39,300.66/58,929.12 = 12,998.34/x
3. Step 3: Cross multiply
   39,300.66x = 58,929.12 × 12,998.34
4. Step 4: Simplify right side
   39,300.66x = 765,980,737.66
5. Step 5: Solve for x
   x = 765,980,737.66/39,300.66
6. Step 6: Final answer
   x = 19,490.28