Finding the Fourth Proportional to 10,618.90, 14,661.70 and 7,439.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,618.90 : 14,661.70 = 7,439.25 : x
2. Step 2: Convert to fraction form
   10,618.90/14,661.70 = 7,439.25/x
3. Step 3: Cross multiply
   10,618.90x = 14,661.70 × 7,439.25
4. Step 4: Simplify right side
   10,618.90x = 109,072,051.73
5. Step 5: Solve for x
   x = 109,072,051.73/10,618.90
6. Step 6: Final answer
   x = 10,271.50