Finding the Fourth Proportional to 21,231,036.53, 31,846,554.79 and 12,706,985.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,231,036.53 : 31,846,554.79 = 12,706,985.33 : x
2. Step 2: Convert to fraction form
   21,231,036.53/31,846,554.79 = 12,706,985.33/x
3. Step 3: Cross multiply
   21,231,036.53x = 31,846,554.79 × 12,706,985.33
4. Step 4: Simplify right side
   21,231,036.53x = 404,673,704,336,571
5. Step 5: Solve for x
   x = 404,673,704,336,571/21,231,036.53
6. Step 6: Final answer
   x = 19,060,477.99