Finding the Fourth Proportional to 14,645.78, 21,972.15 and 4,785.05

Step by Step Solution

1. Step 1: Write the proportion equation
   14,645.78 : 21,972.15 = 4,785.05 : x
2. Step 2: Convert to fraction form
   14,645.78/21,972.15 = 4,785.05/x
3. Step 3: Cross multiply
   14,645.78x = 21,972.15 × 4,785.05
4. Step 4: Simplify right side
   14,645.78x = 105,137,836.36
5. Step 5: Solve for x
   x = 105,137,836.36/14,645.78
6. Step 6: Final answer
   x = 7,178.71