Finding the Fourth Proportional to 14,404.89, 19,878.72 and 7,780.89

Step by Step Solution

1. Step 1: Write the proportion equation
   14,404.89 : 19,878.72 = 7,780.89 : x
2. Step 2: Convert to fraction form
   14,404.89/19,878.72 = 7,780.89/x
3. Step 3: Cross multiply
   14,404.89x = 19,878.72 × 7,780.89
4. Step 4: Simplify right side
   14,404.89x = 154,674,133.66
5. Step 5: Solve for x
   x = 154,674,133.66/14,404.89
6. Step 6: Final answer
   x = 10,737.61