Finding the Fourth Proportional to 12,991.52, 17,928.06 and 7,954.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.52 : 17,928.06 = 7,954.94 : x
2. Step 2: Convert to fraction form
   12,991.52/17,928.06 = 7,954.94/x
3. Step 3: Cross multiply
   12,991.52x = 17,928.06 × 7,954.94
4. Step 4: Simplify right side
   12,991.52x = 142,616,641.62
5. Step 5: Solve for x
   x = 142,616,641.62/12,991.52
6. Step 6: Final answer
   x = 10,977.67