Finding the Fourth Proportional to 53,209.59, 79,807.89 and 13,763.40

Step by Step Solution

1. Step 1: Write the proportion equation
   53,209.59 : 79,807.89 = 13,763.40 : x
2. Step 2: Convert to fraction form
   53,209.59/79,807.89 = 13,763.40/x
3. Step 3: Cross multiply
   53,209.59x = 79,807.89 × 13,763.40
4. Step 4: Simplify right side
   53,209.59x = 1,098,427,913.23
5. Step 5: Solve for x
   x = 1,098,427,913.23/53,209.59
6. Step 6: Final answer
   x = 20,643.42