Finding the Fourth Proportional to 9,985.56, 14,978.32 and 3,411.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985.56 : 14,978.32 = 3,411.79 : x
2. Step 2: Convert to fraction form
   9,985.56/14,978.32 = 3,411.79/x
3. Step 3: Cross multiply
   9,985.56x = 14,978.32 × 3,411.79
4. Step 4: Simplify right side
   9,985.56x = 51,102,882.39
5. Step 5: Solve for x
   x = 51,102,882.39/9,985.56
6. Step 6: Final answer
   x = 5,117.68