Finding the Fourth Proportional to 13,320,288.05, 18,381,997.34 and 7,208,716.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320,288.05 : 18,381,997.34 = 7,208,716.55 : x
2. Step 2: Convert to fraction form
   13,320,288.05/18,381,997.34 = 7,208,716.55/x
3. Step 3: Cross multiply
   13,320,288.05x = 18,381,997.34 × 7,208,716.55
4. Step 4: Simplify right side
   13,320,288.05x = 132,510,608,456,825.39
5. Step 5: Solve for x
   x = 132,510,608,456,825.39/13,320,288.05
6. Step 6: Final answer
   x = 9,948,028.75