Finding the Fourth Proportional to 12,991.50, 19,495.89 and 4,783.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.50 : 19,495.89 = 4,783.50 : x
2. Step 2: Convert to fraction form
   12,991.50/19,495.89 = 4,783.50/x
3. Step 3: Cross multiply
   12,991.50x = 19,495.89 × 4,783.50
4. Step 4: Simplify right side
   12,991.50x = 93,258,589.82
5. Step 5: Solve for x
   x = 93,258,589.82/12,991.50
6. Step 6: Final answer
   x = 7,178.43