Finding the Fourth Proportional to 21,211,796.73, 29,271,455.46 and 12,965,665.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,211,796.73 : 29,271,455.46 = 12,965,665.89 : x
2. Step 2: Convert to fraction form
   21,211,796.73/29,271,455.46 = 12,965,665.89/x
3. Step 3: Cross multiply
   21,211,796.73x = 29,271,455.46 × 12,965,665.89
4. Step 4: Simplify right side
   21,211,796.73x = 379,523,911,608,376.31
5. Step 5: Solve for x
   x = 379,523,911,608,376.31/21,211,796.73
6. Step 6: Final answer
   x = 17,892,115.24