Finding the Fourth Proportional to 21,205,036.42, 29,262,181.89 and 12,958,894.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,205,036.42 : 29,262,181.89 = 12,958,894.42 : x
2. Step 2: Convert to fraction form
   21,205,036.42/29,262,181.89 = 12,958,894.42/x
3. Step 3: Cross multiply
   21,205,036.42x = 29,262,181.89 × 12,958,894.42
4. Step 4: Simplify right side
   21,205,036.42x = 379,205,525,611,346.06
5. Step 5: Solve for x
   x = 379,205,525,611,346.06/21,205,036.42
6. Step 6: Final answer
   x = 17,882,804.73