Finding the Fourth Proportional to 9,978.91, 14,968.47 and 4,783.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.91 : 14,968.47 = 4,783.57 : x
2. Step 2: Convert to fraction form
   9,978.91/14,968.47 = 4,783.57/x
3. Step 3: Cross multiply
   9,978.91x = 14,968.47 × 4,783.57
4. Step 4: Simplify right side
   9,978.91x = 71,602,724.04
5. Step 5: Solve for x
   x = 71,602,724.04/9,978.91
6. Step 6: Final answer
   x = 7,175.41