Finding the Fourth Proportional to 11,972.16, 17,961.12 and 5,047.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,972.16 : 17,961.12 = 5,047.20 : x
2. Step 2: Convert to fraction form
   11,972.16/17,961.12 = 5,047.20/x
3. Step 3: Cross multiply
   11,972.16x = 17,961.12 × 5,047.20
4. Step 4: Simplify right side
   11,972.16x = 90,653,364.86
5. Step 5: Solve for x
   x = 90,653,364.86/11,972.16
6. Step 6: Final answer
   x = 7,572.01