Finding the Fourth Proportional to 9,978.50, 14,959.56 and 4,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.50 : 14,959.56 = 4,139.30 : x
2. Step 2: Convert to fraction form
   9,978.50/14,959.56 = 4,139.30/x
3. Step 3: Cross multiply
   9,978.50x = 14,959.56 × 4,139.30
4. Step 4: Simplify right side
   9,978.50x = 61,922,106.71
5. Step 5: Solve for x
   x = 61,922,106.71/9,978.50
6. Step 6: Final answer
   x = 6,205.55