Finding the Fourth Proportional to 14,142.16, 21,205.71 and 4,278.79

Step by Step Solution

1. Step 1: Write the proportion equation
   14,142.16 : 21,205.71 = 4,278.79 : x
2. Step 2: Convert to fraction form
   14,142.16/21,205.71 = 4,278.79/x
3. Step 3: Cross multiply
   14,142.16x = 21,205.71 × 4,278.79
4. Step 4: Simplify right side
   14,142.16x = 90,734,779.89
5. Step 5: Solve for x
   x = 90,734,779.89/14,142.16
6. Step 6: Final answer
   x = 6,415.91