Finding the Fourth Proportional to 39,989.61, 59,978.27 and 13,336.07

Step by Step Solution

1. Step 1: Write the proportion equation
   39,989.61 : 59,978.27 = 13,336.07 : x
2. Step 2: Convert to fraction form
   39,989.61/59,978.27 = 13,336.07/x
3. Step 3: Cross multiply
   39,989.61x = 59,978.27 × 13,336.07
4. Step 4: Simplify right side
   39,989.61x = 799,874,040.63
5. Step 5: Solve for x
   x = 799,874,040.63/39,989.61
6. Step 6: Final answer
   x = 20,002.05