Finding the Fourth Proportional to 14,978.78, 20,670.56 and 8,264.45

Step by Step Solution

1. Step 1: Write the proportion equation
   14,978.78 : 20,670.56 = 8,264.45 : x
2. Step 2: Convert to fraction form
   14,978.78/20,670.56 = 8,264.45/x
3. Step 3: Cross multiply
   14,978.78x = 20,670.56 × 8,264.45
4. Step 4: Simplify right side
   14,978.78x = 170,830,881.93
5. Step 5: Solve for x
   x = 170,830,881.93/14,978.78
6. Step 6: Final answer
   x = 11,404.86