Finding the Fourth Proportional to 9,818.06, 14,728.91 and 3,978.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,818.06 : 14,728.91 = 3,978.77 : x
2. Step 2: Convert to fraction form
   9,818.06/14,728.91 = 3,978.77/x
3. Step 3: Cross multiply
   9,818.06x = 14,728.91 × 3,978.77
4. Step 4: Simplify right side
   9,818.06x = 58,602,851.70
5. Step 5: Solve for x
   x = 58,602,851.70/9,818.06
6. Step 6: Final answer
   x = 5,968.89