Finding the Fourth Proportional to 39,811.59, 59,724.72 and 13,158.90

Step by Step Solution

1. Step 1: Write the proportion equation
   39,811.59 : 59,724.72 = 13,158.90 : x
2. Step 2: Convert to fraction form
   39,811.59/59,724.72 = 13,158.90/x
3. Step 3: Cross multiply
   39,811.59x = 59,724.72 × 13,158.90
4. Step 4: Simplify right side
   39,811.59x = 785,911,618.01
5. Step 5: Solve for x
   x = 785,911,618.01/39,811.59
6. Step 6: Final answer
   x = 19,740.77