Finding the Fourth Proportional to 10,980.42, 15,159.98 and 7,210.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,980.42 : 15,159.98 = 7,210.28 : x
2. Step 2: Convert to fraction form
   10,980.42/15,159.98 = 7,210.28/x
3. Step 3: Cross multiply
   10,980.42x = 15,159.98 × 7,210.28
4. Step 4: Simplify right side
   10,980.42x = 109,307,700.59
5. Step 5: Solve for x
   x = 109,307,700.59/10,980.42
6. Step 6: Final answer
   x = 9,954.78