Finding the Fourth Proportional to 11,157.84, 15,394.72 and 7,972.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,157.84 : 15,394.72 = 7,972.10 : x
2. Step 2: Convert to fraction form
   11,157.84/15,394.72 = 7,972.10/x
3. Step 3: Cross multiply
   11,157.84x = 15,394.72 × 7,972.10
4. Step 4: Simplify right side
   11,157.84x = 122,728,247.31
5. Step 5: Solve for x
   x = 122,728,247.31/11,157.84
6. Step 6: Final answer
   x = 10,999.28