Finding the Fourth Proportional to 21,696,326.42, 29,938,951.49 and 12,874,257.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,696,326.42 : 29,938,951.49 = 12,874,257.45 : x
2. Step 2: Convert to fraction form
   21,696,326.42/29,938,951.49 = 12,874,257.45/x
3. Step 3: Cross multiply
   21,696,326.42x = 29,938,951.49 × 12,874,257.45
4. Step 4: Simplify right side
   21,696,326.42x = 385,441,769,200,949.81
5. Step 5: Solve for x
   x = 385,441,769,200,949.81/21,696,326.42
6. Step 6: Final answer
   x = 17,765,300.99