Finding the Fourth Proportional to 72,805.50, 109,200.96 and 53,122.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,805.50 : 109,200.96 = 53,122.50 : x
2. Step 2: Convert to fraction form
   72,805.50/109,200.96 = 53,122.50/x
3. Step 3: Cross multiply
   72,805.50x = 109,200.96 × 53,122.50
4. Step 4: Simplify right side
   72,805.50x = 5,801,027,997.60
5. Step 5: Solve for x
   x = 5,801,027,997.60/72,805.50
6. Step 6: Final answer
   x = 79,678.43